Add starter project for Chapter 13

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

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+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
+    {
+    }
+}

Chapter13/Start/UnoMediaCollection/UnoMediaCollection.DataContracts/UnoMediaCollection.DataContracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFramework>net7.0</TargetFramework>
+		<GenerateDocumentationFile>true</GenerateDocumentationFile>
+	</PropertyGroup>
+</Project>

Chapter13/Start/UnoMediaCollection/UnoMediaCollection.DataContracts/WeatherForecast.cs

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+namespace UnoMediaCollection.DataContracts
+{
+    /// <summary>
+    /// A Weather Forecast for a specific date
+    /// </summary>
+    /// <param name="Date">Gets the Date of the Forecast.</param>
+    /// <param name="TemperatureC">Gets the Forecast Temperature in Celsius.</param>
+    /// <param name="Summary">Get a description of how the weather will feel.</param>
+    public record WeatherForecast(DateOnly Date, double TemperatureC, string? Summary)
+    {
+        /// <summary>
+        /// Gets the Forecast Temperature in Fahrenheit
+        /// </summary>
+        public double TemperatureF => 32 + (TemperatureC * 9 / 5);
+    }
+}