Add example_project

test/dotnet/example_project/.gitignore

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+bin
+obj

test/dotnet/example_project/Movie.cs

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+// See https://aka.ms/new-console-template for more information
+
+internal class Movie
+{
+    public string Name { get; set; } = "Default Name";
+    public DateTime ReleaseDate { get; set; }
+    public List<string> Genres { get; set; } = new List<string>();
+}

test/dotnet/example_project/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using Newtonsoft.Json;
+
+Console.WriteLine("Hello, World!");
+
+string json = @"{
+  'Name': 'Inception',
+  'ReleaseDate': '2010-07-08T00:00:00',
+  'Genres': [
+    'Action',
+    'Thriller'
+  ]
+}";
+
+Movie? m = JsonConvert.DeserializeObject<Movie>(json);
+
+if (m == default)
+{
+    Console.WriteLine("Decoding failed!");
+}
+else
+{
+    Console.WriteLine($"Name: {m.Name}");
+    Console.WriteLine($"Release Date: {m.ReleaseDate}");
+    Console.WriteLine($"Genres: {string.Join(", ", m.Genres)}");
+}

test/dotnet/example_project/example_project.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>