add monitor design pattern (#1640)

* add monitor design pattern .

* add extra line and change compiler version to 11 in pom.xml.

* encapsulate getBalance method .

* update puml file .

* export uml as png .

* duplicate codes eliminated .

* update tag

* change the format of pom.xml

* using logger to print

* change AtomicRefrence to type inference var

* explanations added !

* Update monitor/README.md

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* Update monitor/README.md

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* Update monitor/src/main/java/com/iluwatar/monitor/Main.java

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* Update monitor/src/main/java/com/iluwatar/monitor/Main.java

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* Update monitor/src/main/java/com/iluwatar/monitor/Main.java

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* Update monitor/src/main/java/com/iluwatar/monitor/Main.java

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

* e.printStackTrace have changed to logger to prints standard output (STD OUT) .

* add programmatic example .

* Delete mvnw

* mvnw.cmd deleted .

* added mvnw from master

* AddUnitTest

* Add language to readme.md

Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>
Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>
Co-authored-by: Subhrodip Mohanta <subhromo@cisco.com>
Co-authored-by: Subhrodip Mohanta <contact@subho.xyz>

monitor/etc/monitor.urm.puml

@@ -0,0 +1,12 @@
+@startuml
+Main - Bank : use
+class Main{
+    + main(args : String[]) : void
+}
+class Bank{
+    - accounts : int[]
+    + Bank (accountNum : int , baseAccount : int)
+    + transfer(accountA : int , accountB : int , amount : int) : void {synchronized}
+    - getBalance() : void {synchronized}
+}
+@enduml