feat: test connection to backend

tetris/backend.py

@@ -0,0 +1,8 @@
+from signalrcore.hub_connection_builder import HubConnectionBuilder
+
+server_url = "https://tetriscloneapp.azurewebsites.net/player"
+hub_connection = HubConnectionBuilder()\
+    .with_url(server_url)\
+    .build()
+    
+hub_connection.send("EnterGame", ["abc123"], lambda m: print(m))