#590 Add explanation for Adapter

adapter/etc/adapter.urm.puml

@@ -1,37 +0,0 @@
-@startuml
-package com.iluwatar.adapter {
-  class App {
-    + App()
-    + main(args : String[]) {static}
-  }
-  class BattleFishingBoat {
-    - LOGGER : Logger {static}
-    - boat : FishingBoat
-    + BattleFishingBoat()
-    + fire()
-    + move()
-  }
-  interface BattleShip {
-    + fire() {abstract}
-    + move() {abstract}
-  }
-  class Captain {
-    - battleship : BattleShip
-    + Captain()
-    + Captain(battleship : BattleShip)
-    + fire()
-    + move()
-    + setBattleship(battleship : BattleShip)
-  }
-  class FishingBoat {
-    - LOGGER : Logger {static}
-    + FishingBoat()
-    + fish()
-    + sail()
-  }
-}
-BattleFishingBoat -->  "-boat" FishingBoat
-Captain -->  "-battleship" BattleShip
-BattleFishingBoat ..|> BattleShip 
-Captain ..|> BattleShip 
-@enduml