Add: Minimodel FindPosByUsername-> for GUI

src/main/java/it/polimi/ingsw/gc14/Model/MiniModel.java

@@ -45,4 +45,17 @@ public class MiniModel implements Serializable {
     {
         players.put(player.getUserName(),player);
     }
+    public int getPositionByUsername(String username)
+    {
+        int i=0;
+        for (Player player : players.values())
+        {
+            if(player.getUserName().equals(username))
+            {
+                return i;
+            }
+            i++;
+        }
+        return  -1;
+    }
 }