Add project files.

BlazorApp2/Data/WeatherForecastService.cs

@@ -0,0 +1,20 @@
+namespace BlazorApp2.Data
+{
+    public class WeatherForecastService
+    {
+        private static readonly string[] Summaries = new[]
+        {
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+        };
+
+        public Task<WeatherForecast[]> GetForecastAsync(DateOnly startDate)
+        {
+            return Task.FromResult(Enumerable.Range(1, 5).Select(index => new WeatherForecast
+            {
+                Date = startDate.AddDays(index),
+                TemperatureC = Random.Shared.Next(-20, 55),
+                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+            }).ToArray());
+        }
+    }
+}