Setup basic class to test with windows forms

- Added DrawControl class to test windows forms with raylib. Need a way to get the window handle?

ExampleApplication/Raylib-cs/DrawControl.cs

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+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace Raylib
+{
+    class DrawControl : Form
+    {
+        private Panel panel;
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr SetParent(IntPtr child, IntPtr newParent);
+        [DllImport("user32.dll")]
+        private static extern IntPtr ShowWindow(IntPtr handle, int command);
+
+        public static void Run()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new DrawControl());
+        }
+
+        public DrawControl()
+        {
+            panel = new Panel();
+            panel.Size = new Size(640, 480);
+            panel.Location = new Point(80, 10);
+            panel.BackColor = System.Drawing.Color.Red;
+            Controls.Add(panel);
+
+            // TODO: get raylib window handle?
+            IntPtr winHandle = IntPtr.Zero;
+            SetParent(winHandle, panel.Handle);
+            ShowWindow(winHandle, 1);
+        }
+    }
+}