feat: add signalr hub and github workflow

TetrisClone.WebApi/Controllers/TetrisController.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace TetrisClone.WebApi.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class TetrisController : ControllerBase
+    {
+        private readonly ILogger<TetrisController> _logger;
+
+        public TetrisController(ILogger<TetrisController> logger)
+        {
+            _logger = logger;
+        }
+
+        [HttpGet]
+        public ActionResult Get()
+        {
+            return new EmptyResult();
+        }
+    }
+}