Adding new WinForms sample application (#452)

samples/CSharpWinForms/Program.cs

@@ -0,0 +1,31 @@
+using Velopack;
+
+namespace CSharpWinForms;
+
+internal static class Program
+{
+    // Logging is essential for debugging! Ideally you should write it to a file.
+    public static MemoryLogger Log { get; } = new MemoryLogger();
+
+    /// <summary>
+    ///  The main entry point for the application.
+    /// </summary>
+    [STAThread]
+    static void Main()
+    {
+        try {
+            // It's important to Run() the VelopackApp as early as possible in app startup.
+            VelopackApp.Build()
+                .WithFirstRun((v) => { /* Your first run code here */ })
+                .Run(Log);
+
+            // To customize application configuration such as set high DPI settings or default font,
+            // see https://aka.ms/applicationconfiguration.
+            ApplicationConfiguration.Initialize();
+            Application.Run(new Form1());
+
+        } catch (Exception ex) {
+            MessageBox.Show("Unhandled exception: " + ex.ToString());
+        }
+    }
+}