Add direct-connect multiplayer foundation

network/network_transport.gd

@@ -0,0 +1,34 @@
+class_name NetworkTransport
+extends Node
+
+signal transport_error(message: String)
+
+var _peer: MultiplayerPeer
+var _route_description: String = ""
+
+
+func start_host(
+	_port: int,
+	_max_clients: int,
+	_bind_address: String = "*",
+) -> Error:
+	return ERR_UNAVAILABLE
+
+
+func connect_to_route(_route: ConnectionRoute) -> Error:
+	return ERR_UNAVAILABLE
+
+
+func disconnect_transport() -> void:
+	if _peer != null:
+		_peer.close()
+	_peer = null
+	_route_description = ""
+
+
+func get_multiplayer_peer() -> MultiplayerPeer:
+	return _peer
+
+
+func get_route_description() -> String:
+	return _route_description