Add STAThread notice to README (#302)

README.md

@@ -62,6 +62,8 @@ namespace HelloWorld;
 
 class Program
 {
+    // STAThread is required if you deploy using NativeAOT on Windows - See https://github.com/raylib-cs/raylib-cs/issues/301
+    [STAThread]
     public static void Main()
     {
         Raylib.InitWindow(800, 480, "Hello World");