Add starter project for Chapter 13

Chapter13/Start/UnoMediaCollection/UnoMediaCollection.DataContracts/Serialization/WeatherForecastContext.cs

@@ -0,0 +1,25 @@
+using System.Collections.Immutable;
+using System.Text.Json.Serialization;
+
+namespace UnoMediaCollection.DataContracts.Serialization
+{
+    /// <summary>
+    /// Generated class for System.Text.Json Serialization
+    /// </summary>
+    /// <remarks>
+    /// When using the JsonSerializerContext you must add the JsonSerializableAttribute
+    /// for each type that you may need to serialize / deserialize including both the
+    /// concrete type and any interface that the concrete type implements.
+    /// For more information on the JsonSerializerContext see:
+    /// https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/source-generation?WT.mc_id=DT-MVP-5002924
+    /// </remarks>
+    [JsonSerializable(typeof(WeatherForecast))]
+    [JsonSerializable(typeof(WeatherForecast[]))]
+    [JsonSerializable(typeof(IEnumerable<WeatherForecast>))]
+    [JsonSerializable(typeof(IImmutableList<WeatherForecast>))]
+    [JsonSerializable(typeof(ImmutableList<WeatherForecast>))]
+    [JsonSourceGenerationOptions(PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
+    public partial class WeatherForecastContext : JsonSerializerContext
+    {
+    }
+}