fix: Add Solution in Curriculum/Challenges/English/08/CodingInterviewProblems/DataStructures/CREATE_LINKED_LIST_CLASS.md (#35819)

* fix: add solution create linked list class

* fix: added extra line to avoid linting error

* fix: renamed some variables

curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-linked-list-class.english.md

@@ -78,6 +78,40 @@ function LinkedList() {
 <section id='solution'>
 
 ```js
-// solution required
+function LinkedList() { 
+  var length = 0; 
+  var head = null; 
+
+  var Node = function(element){
+    this.element = element; 
+    this.next = null; 
+  }; 
+
+  this.head = function(){
+    return head;
+  };
+
+  this.size = function(){
+    return length;
+  };
+
+  this.add = function(element){
+    // Only change code below this line
+    if (head == null) {
+      head = new Node(element);
+    } 
+    else {
+      let currentNode = head;
+      while (currentNode.next != null) {
+        // currentNode.next will be last node of linked list after loop
+        currentNode = currentNode.next;
+      }
+      currentNode.next = new Node(element);
+    }
+    length++;
+    // Only change code above this line
+  };
+}
 ```
+
 </section>