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/shapes/shapes_basic_shapes.cs

@@ -0,0 +1,7 @@
+using Raylib;
+using static Raylib.Raylib;
+
+public partial class Examples
+{
+    /*******************************************************************************************
    *
    *   raylib [shapes] example - Draw basic shapes 2d (rectangle, circle, line...)
    *
    *   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) 2014 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/
    
    
    public static void Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;
    
        InitWindow(screenWidth, screenHeight, "raylib [shapes] example - basic shapes drawing");
        
        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("some basic shapes available on raylib", 20, 20, 20, DARKGRAY);
    
                DrawLine(18, 42, screenWidth - 18, 42, BLACK);
    
                DrawCircle(screenWidth/4, 120, 35, DARKBLUE);
                DrawCircleGradient(screenWidth/4, 220, 60, GREEN, SKYBLUE);
                DrawCircleLines(screenWidth/4, 340, 80, DARKBLUE);
    
                DrawRectangle(screenWidth/4*2 - 60, 100, 120, 60, RED);
                DrawRectangleGradientH(screenWidth/4*2 - 90, 170, 180, 130, MAROON, GOLD);
                DrawRectangleLines(screenWidth/4*2 - 40, 320, 80, 60, ORANGE);
    
                DrawTriangle(new Vector2(screenWidth/4*3, 80);,
                             new Vector2(screenWidth/4*3 - 60, 150);,
                             new Vector2(screenWidth/4*3 + 60, 150);, VIOLET);
    
                DrawTriangleLines(new Vector2(screenWidth/4*3, 160);,
                                  new Vector2(screenWidth/4*3 - 20, 230);,
                                  new Vector2(screenWidth/4*3 + 20, 230);, DARKBLUE);
    
                DrawPoly(new Vector2(screenWidth/4*3, 320);, 6, 80, 0, BROWN);
    
            EndDrawing();
            //----------------------------------------------------------------------------------
        }
    
        // De-Initialization
        //--------------------------------------------------------------------------------------
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------
    
        return 0;
    }    
+}