Added initial Uno Platform frontend project.

FrontendPlatformUno/FrontendPlatformUno.DataContracts/Serialization/WeatherForecastContext.cs

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+using System.Collections.Immutable;
+using System.Text.Json.Serialization;
+
+namespace FrontendPlatformUno.DataContracts.Serialization
+{
+    /*
+     * 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
+     */
+    [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
+    {
+    }
+}