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/core/core_basic_window.cs

@@ -0,0 +1 @@
+using Raylib;
using static Raylib.Raylib;

public partial class Examples
{
    /*******************************************************************************************
    *
    *   raylib [core] example - Basic window
    *
    *   Welcome to raylib!
    *
    *   To test examples, just press F6 and execute raylib_compile_execute script
    *   Note that compiled executable is placed in the same folder as .c file
    *
    *   You can find all basic examples on C:\raylib\raylib\examples folder or
    *   raylib official webpage: www.raylib.com
    *
    *   Enjoy using raylib. :)
    *
    *   This example has been created using raylib 1.0 (www.raylib.com)
    *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
    *
    *   Copyright (c) 2013-2016 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/
    
    
    public static void Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;
    
        InitWindow(screenWidth, screenHeight, "raylib [core] example - basic window");
        
        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------
    
        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            // TODO: Update your variables here
            //----------------------------------------------------------------------------------
    
            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
    
                ClearBackground(RAYWHITE);
    
                DrawText("Congrats! You created your first window!", 190, 200, 20, MAROON);
    
            EndDrawing();
            //----------------------------------------------------------------------------------
        }
    
        // De-Initialization
        //--------------------------------------------------------------------------------------   
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------
    
    }    
}