Changing examples to use makefile

- Testing a modified version of the makefile from raylib Instead of multiple project files for examples.
- Fixed readme example

Examples/Program.cs

@@ -1,11 +0,0 @@
-
-namespace ExamplesTest
-{
-    class Program
-    {
-        static void Main(string[] args)
-        {
-            Examples.core_basic_window();
-        }
-    }
-}