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_mouse_wheel.cs

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

public partial class Examples
{
    /*******************************************************************************************
    *
    *   raylib [core] examples - Mouse wheel
    *
    *   This test has been created using raylib 1.1 (www.raylib.com)
    *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
    *
    *   Copyright (c) 2014 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/
    
    
    public static void Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;
    
        InitWindow(screenWidth, screenHeight, "raylib [core] example - mouse wheel");
    
        int boxPositionY = screenHeight/2 - 40;
        int scrollSpeed = 4;            // Scrolling speed in pixels
    
        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------
    
        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            boxPositionY -= (GetMouseWheelMove()*scrollSpeed);
            //----------------------------------------------------------------------------------
    
            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
    
                ClearBackground(RAYWHITE);
    
                DrawRectangle(screenWidth/2 - 40, boxPositionY, 80, 80, MAROON);
    
                DrawText("Use mouse wheel to move the cube up and down!", 10, 10, 20, GRAY);
                DrawText(FormatText("Box position Y: %03i", boxPositionY), 10, 40, 20, LIGHTGRAY);
    
            EndDrawing();
            //----------------------------------------------------------------------------------
        }
    
        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------
    
    }    
}