docs: update .all-contributorsrc [skip ci]

* add explanation for twin pattern

* updated explanation of twin pattern

.all-contributorsrc

@@ -16,6 +16,17 @@
         "content"
       ]
     },
+    {
+      "login": "ohbus",
+      "name": "Subhrodip Mohanta",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/13291222?v=4",
+      "profile": "http://subho.xyz",
+      "contributions": [
+        "code",
+        "review",
+        "maintenance"
+      ]
+    },
     {
       "login": "amit1307",
       "name": "amit1307",
@@ -1125,17 +1136,6 @@
         "ideas"
       ]
     },
-    {
-      "login": "ohbus",
-      "name": "Subhrodip Mohanta",
-      "avatar_url": "https://avatars0.githubusercontent.com/u/13291222?v=4",
-      "profile": "http://subho.xyz",
-      "contributions": [
-        "code",
-        "review",
-        "maintenance"
-      ]
-    },
     {
       "login": "nahteb",
       "name": "Bethan Palmer",
@@ -1658,6 +1658,33 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "carldea",
+      "name": "Carl Dea",
+      "avatar_url": "https://avatars.githubusercontent.com/u/1594624?v=4",
+      "profile": "http://carlfx.wordpress.com",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "Mozartuss",
+      "name": "Mozartus",
+      "avatar_url": "https://avatars.githubusercontent.com/u/32893711?v=4",
+      "profile": "https://github.com/Mozartuss",
+      "contributions": [
+        "translation"
+      ]
+    },
+    {
+      "login": "ManviGoel26",
+      "name": "Manvi Goel",
+      "avatar_url": "https://avatars.githubusercontent.com/u/55682355?v=4",
+      "profile": "https://github.com/ManviGoel26",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-182-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-185-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -78,8 +78,8 @@ This project is licensed under the terms of the MIT license.
   <tr>
     <td align="center"><a href="https://github.com/iluwatar"><img src="https://avatars1.githubusercontent.com/u/582346?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ilkka Seppälä</b></sub></a><br /><a href="#projectManagement-iluwatar" title="Project Management">📆</a> <a href="#maintenance-iluwatar" title="Maintenance">🚧</a> <a href="#content-iluwatar" title="Content">🖋</a></td>
     <td align="center"><a href="http://subho.xyz"><img src="https://avatars0.githubusercontent.com/u/13291222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Subhrodip Mohanta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ohbus" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aohbus" title="Reviewed Pull Requests">👀</a> <a href="#maintenance-ohbus" title="Maintenance">🚧</a></td>
-    <td align="center"><a href="https://github.com/npathai"><img src="https://avatars2.githubusercontent.com/u/1792515?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Narendra Pathai</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=npathai" title="Code">💻</a> <a href="#ideas-npathai" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Anpathai" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://github.com/amit1307"><img src="https://avatars0.githubusercontent.com/u/23420222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>amit1307</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=amit1307" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/npathai"><img src="https://avatars2.githubusercontent.com/u/1792515?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Narendra Pathai</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=npathai" title="Code">💻</a> <a href="#ideas-npathai" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Anpathai" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://github.com/fluxw42"><img src="https://avatars1.githubusercontent.com/u/1545460?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jeroen Meulemeester</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=fluxw42" title="Code">💻</a></td>
     <td align="center"><a href="http://www.joemccarthy.co.uk"><img src="https://avatars0.githubusercontent.com/u/4526195?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Joseph McCarthy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mikulucky" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/thomasoss"><img src="https://avatars1.githubusercontent.com/u/22516154?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Thomas</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=thomasoss" title="Code">💻</a></td>
@@ -193,8 +193,8 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://github.com/hoswey"><img src="https://avatars3.githubusercontent.com/u/3689445?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Hoswey</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hoswey" title="Code">💻</a></td>
   </tr>
   <tr>
-    <td align="center"><a href="https://github.com/gwildor28"><img src="https://avatars0.githubusercontent.com/u/16000365?v=4?s=100" width="100px;" alt=""/><br /><sub><b>gwildor28</b></sub></a><br /><a href="#content-gwildor28" title="Content">🖋</a></td>
     <td align="center"><a href="https://github.com/amit2103"><img src="https://avatars3.githubusercontent.com/u/7566692?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Amit Pandey</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=amit2103" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/gwildor28"><img src="https://avatars0.githubusercontent.com/u/16000365?v=4?s=100" width="100px;" alt=""/><br /><sub><b>gwildor28</b></sub></a><br /><a href="#content-gwildor28" title="Content">🖋</a></td>
     <td align="center"><a href="https://t.me/paul_docker"><img src="https://avatars1.githubusercontent.com/u/2404785?v=4?s=100" width="100px;" alt=""/><br /><sub><b>田浩</b></sub></a><br /><a href="#content-llitfkitfk" title="Content">🖋</a></td>
     <td align="center"><a href="https://twitter.com/StPitsios"><img src="https://avatars1.githubusercontent.com/u/6773603?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Stamatis Pitsios</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=pitsios-s" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/qza"><img src="https://avatars3.githubusercontent.com/u/233149?v=4?s=100" width="100px;" alt=""/><br /><sub><b>qza</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qza" title="Code">💻</a></td>
@@ -309,6 +309,11 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://programacionymas.com"><img src="https://avatars.githubusercontent.com/u/3101238?v=4?s=100" width="100px;" alt=""/><br /><sub><b>JCarlos</b></sub></a><br /><a href="#translation-JCarlosR" title="Translation">🌍</a></td>
     <td align="center"><a href="https://www.mrmoshkel.ir"><img src="https://avatars.githubusercontent.com/u/60359433?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ali Ghasemi</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Dev-AliGhasemi" title="Code">💻</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="http://carlfx.wordpress.com"><img src="https://avatars.githubusercontent.com/u/1594624?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Carl Dea</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=carldea" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/Mozartuss"><img src="https://avatars.githubusercontent.com/u/32893711?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mozartus</b></sub></a><br /><a href="#translation-Mozartuss" title="Translation">🌍</a></td>
+    <td align="center"><a href="https://github.com/ManviGoel26"><img src="https://avatars.githubusercontent.com/u/55682355?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Manvi Goel</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ManviGoel26" title="Documentation">📖</a></td>
+  </tr>
 </table>
 
 <!-- markdownlint-restore -->

twin/README.md

@@ -13,6 +13,144 @@ tags:
 Twin pattern is a design pattern which provides a standard solution to simulate multiple
 inheritance in java
 
+## Explanation
+
+Real-world example
+
+> Consider a game with a ball that needs features of two types, Game Item, and threads to function 
+> smoothly in the game. We can use two objects, with one object compatible with the first type and 
+> the other compatible with the second type.  
+> The pair of objects together can function as one ball in the game. 
+
+In plain words
+
+> It provides a way to form two closely coupled sub-classes that can act as a twin class having two ends. 
+
+Wikipedia says
+
+> In software engineering, the Twin pattern is a software design pattern that allows developers 
+> to model multiple inheritance in programming languages that do not support multiple inheritance. 
+> This pattern avoids many of the problems with multiple inheritance.
+
+**Programmatic Example**
+
+Take our game ball example from above. Consider we have a game in which the ball needs to be both a `GameItem` and `Thread`. 
+First of all, we have the `GameItem` class given below and the `Thread` class.
+
+
+```java
+
+@Slf4j
+public abstract class GameItem {
+
+  public void draw() {
+    LOGGER.info("draw");
+    doDraw();
+  }
+
+  public abstract void doDraw();
+
+
+  public abstract void click();
+}
+
+```
+
+Then, we have subclasses `BallItem` and `BallThread` inheriting them, respectively.
+
+```java
+
+@Slf4j
+public class BallItem extends GameItem {
+
+  private boolean isSuspended;
+
+  @Setter
+  private BallThread twin;
+
+  @Override
+  public void doDraw() {
+
+    LOGGER.info("doDraw");
+  }
+
+  public void move() {
+    LOGGER.info("move");
+  }
+
+  @Override
+  public void click() {
+
+    isSuspended = !isSuspended;
+
+    if (isSuspended) {
+      twin.suspendMe();
+    } else {
+      twin.resumeMe();
+    }
+  }
+}
+
+
+@Slf4j
+public class BallThread extends Thread {
+
+  @Setter
+  private BallItem twin;
+
+  private volatile boolean isSuspended;
+
+  private volatile boolean isRunning = true;
+
+  /**
+   * Run the thread.
+   */
+  public void run() {
+
+    while (isRunning) {
+      if (!isSuspended) {
+        twin.draw();
+        twin.move();
+      }
+      try {
+        Thread.sleep(250);
+      } catch (InterruptedException e) {
+        throw new RuntimeException(e);
+      }
+    }
+  }
+
+  public void suspendMe() {
+    isSuspended = true;
+    LOGGER.info("Begin to suspend BallThread");
+  }
+
+  public void resumeMe() {
+    isSuspended = false;
+    LOGGER.info("Begin to resume BallThread");
+  }
+
+  public void stopMe() {
+    this.isRunning = false;
+    this.isSuspended = true;
+  }
+}
+
+``` 
+
+Now, when we need the ball, we can instantiate objects from both the `BallThread` and `BallItem` as a pair and pass them to its pair object so they can act together as appropriate.
+
+```java
+
+var ballItem = new BallItem();
+var ballThread = new BallThread();
+
+ballItem.setTwin(ballThread);
+ballThread.setTwin(ballItem);
+
+```
+
+
 ## Class diagram
 ![alt text](./etc/twin.png "Twin")