Updated 'Game' class.

Updated the 'Game' class by adding the 'getPlayerIdByColor' method to it.

Projekte/mdga/model/src/main/java/pp/mdga/game/Game.java

@@ -152,6 +152,22 @@ public Player getPlayerByColor(Color color) {
         return null;
     }
 
+    /**
+     * This method will be used to return the id of the Player defined by the given color parameter.
+     *
+     * @param color as the color of the player as a Color enumeration.
+     * @return      the id of the player as an Integer.
+     */
+    public int getPlayerIdByColor(Color color) {
+        for (Map.Entry<Integer, Player> entry : this.players.entrySet()) {
+            if (entry.getValue().getColor() == color) {
+                return entry.getKey();
+            }
+        }
+
+        return -1;
+    }
+
     /**
      * This method will be used to return the number of active players of this game.
      *