Added initial Uno Platform frontend project.

FrontendPlatformUno/FrontendPlatformUno.DataContracts/FrontendPlatformUno.DataContracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFramework>net7.0</TargetFramework>
+		<GenerateDocumentationFile>true</GenerateDocumentationFile>
+		<!-- Suppress Compiler warnings for elements without XML Docs -->
+		<NoWarn>$(NoWarn);CS1591</NoWarn>
+	</PropertyGroup>
+</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
+    {
+    }
+}

FrontendPlatformUno/FrontendPlatformUno.DataContracts/WeatherForecast.cs

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+namespace FrontendPlatformUno.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, int TemperatureC, string? Summary)
+    {
+        /// <summary>
+        /// Gets the Forecast Temperature in Fahrenheit
+        /// </summary>
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+    }
+}