Add project files.

Program.cs

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+/*
+Rusty Hearts Launcher - Windows Forms Implementation in C#
+Author: JuniorDark
+GitHub Repository: https://github.com/JuniorDark/RustyHearts-Launcher
+This code serves as a starting point for creating your own launcher.
+However, it requires further development to improve functionality and
+ensure stability. Please check the GitHub repository for updates.
+*/
+
+namespace RHLauncher
+{
+    internal static class Program
+    {
+        private static readonly Mutex mutex = new(false, "Launcher");
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        private static void Main()
+        {
+
+            if (mutex.WaitOne(TimeSpan.Zero, true))
+            {
+                // To customize application configuration such as set high DPI settings or default font,
+                // see https://aka.ms/applicationconfiguration.
+                ApplicationConfiguration.Initialize();
+                Application.Run(new LoginForm());
+                mutex.ReleaseMutex();
+            }
+            else
+            {
+                MessageBox.Show("Only one instance of the launcher can run at a time.");
+            }
+        }
+    }
+}