Add NativeFileDialogs.Net examples

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

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

@@ -0,0 +1,23 @@
+// 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 System.Collections.Generic;
+using NativeFileDialogs.Net;
+
+NfdStatus result = Nfd.SaveDialog(out string? savePath, new Dictionary<string, string>()
+{
+    { "Source code", "c,cpp,cc" },
+    { "Headers", "h,hpp" },
+}, defaultName: "Untitled.c");
+
+if (result == NfdStatus.Ok)
+{
+    Console.WriteLine("Success!");
+    Console.WriteLine(savePath);
+}
+else
+{
+    Console.WriteLine("User pressed Cancel.");
+}