feat : init webAPI project

WeatherForecast.cs

@@ -0,0 +1,12 @@
+namespace fubon_api;
+
+public class WeatherForecast
+{
+    public DateOnly Date { get; set; }
+
+    public int TemperatureC { get; set; }
+
+    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+    public string? Summary { get; set; }
+}