Add NativeFileDialogs.Net examples

They look much easier to deal with, don't they?

Examples/Net/NativeFileDialogs.Net.Example.PickFolder/NativeFileDialogs.Net.Example.PickFolder.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup Label="Project">
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup Label="Project References">
+    <ProjectReference Include="..\..\..\NativeFileDialogs.Net\NativeFileDialogs.Net.csproj" />
+  </ItemGroup>
+
+  <ItemGroup Label="Package References">
+    <PackageReference Include="NativeFileDialogs.Net.Runtime" Version="0.1.0-alpha" />
+  </ItemGroup>
+
+</Project>

Examples/Net/NativeFileDialogs.Net.Example.PickFolder/Program.cs

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+// Copyright (c) Speykious
+// This file is part of NativeFileDialogs.NET.
+// NativeFileDialogs.NET is licensed under the Zlib License. See LICENSE for details.
+
+using System;
+using NativeFileDialogs.Net;
+
+NfdStatus result = Nfd.PickFolder(out string? outPath);
+
+if (result == NfdStatus.Ok)
+{
+    Console.WriteLine("Success!");
+    Console.WriteLine(outPath);
+}
+else
+{
+    Console.WriteLine("User pressed Cancel.");
+}