feat: add web api project

TetrisClone.WebApi/WeatherForecast.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace TetrisClone.WebApi
+{
+    public class WeatherForecast
+    {
+        public DateTime Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+        public string Summary { get; set; }
+    }
+}