added multiplayer connection. TODO: Sync Inventory values. Disable moving of other color tiles

UI/join_menu.gd

@@ -0,0 +1,21 @@
+extends Control
+
+@onready var lobby_code_input = $PanelContainer/MarginContainer/VBoxContainer/HBoxContainer/LobbyCodeInput
+
+func _ready():
+	WSClient.lobby_joined.connect(_on_lobby_joined)
+
+func _on_lobby_joined(lobby: String) -> void:
+	GameData.lobby_code = lobby
+	
+	get_tree().change_scene_to_file("res://Multiplayer/Multiplayer.tscn")
+
+func _process(delta):
+	pass
+
+func _on_back_button_pressed():
+	get_tree().change_scene_to_file("res://main_menu.tscn")
+
+func _on_connect_button_pressed():
+	GameData.is_player_black = true
+	WSClient.start(GameData.WEBSOCKET_ENDPOINT, lobby_code_input.text)