feat(ui): add Lobby and Main Menu Body (#38)

Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #38
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/logic/game/GameLobby.scala

@@ -88,12 +88,12 @@ class GameLobby private(
    * Remove the user from the game lobby.
    * @param user the user who wants to leave the game.
    */
-  def leaveGame(user: User): Unit = {
-    val sessionOpt = users.get(user.id)
+  def leaveGame(userId: UUID): Unit = {
+    val sessionOpt = users.get(userId)
     if (sessionOpt.isEmpty) {
       throw new NotInThisGameException("You are not in this game!")
     }
-    users.remove(user.id)
+    users.remove(userId)
   }
 
   /**
@@ -176,6 +176,14 @@ class GameLobby private(
     getPlayerBySession(getUserSession(user.id))
   }
 
+  def getPlayers: mutable.Map[UUID, UserSession] = {
+    users.clone()
+  }
+
+  def getLogic: GameLogic = {
+    logic
+  }
+
   private def getPlayerBySession(userSession: UserSession): AbstractPlayer = {
     val playerOption = getMatch.totalplayers.find(_.id == userSession.id)
     if (playerOption.isEmpty) {