feat: add signalr hub and github workflow

TetrisClone.WebApi/Model/PieceType.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace TetrisClone.WebApi.Model
+{
+    public enum PieceType
+    {
+        I,
+        J,
+        L,
+        O,
+        S,
+        T,
+        Z
+    }
+}