Resolve "Connect FindGameController to backend"

backend/src/index.ts

backend/src/interfaces/ILobby.ts

backend/src/lobby/Lobby.ts

frontend/assets/menu-textures.atlas

frontend/assets/menu-textures.png

frontend/core/src/com/game/tankwars/HTTPRequestHandler.java

frontend/core/src/com/game/tankwars/ReceiverHandler.java

frontend/core/src/com/game/tankwars/TankWarsGame.java

.../src/com/game/tankwars/controller/FindGameController.java

frontend/core/src/com/game/tankwars/model/LobbyId.java

frontend/core/src/com/game/tankwars/model/LobbyStatus.java

frontend/core/src/com/game/tankwars/view/FindGameScreen.java