Add raylib lua examples

examples/textures_rectangle.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [textures] example - Texture loading and drawing a part defined by a rectangle
+--
+--  This example has been created using raylib 1.6 (www.raylib.com)
+--  raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+--
+--  Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
+--
+-------------------------------------------------------------------------------------------
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [texture] example - texture rectangle")
+
+-- NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+local guybrush = LoadTexture("resources/guybrush.png")        -- Texture loading
+
+local position = Vector2(350.0, 240.0)
+local frameRec = Rectangle(0, 0, guybrush.width/7, guybrush.height)
+local currentFrame = 0
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    if (IsKeyPressed(KEY.RIGHT)) then
+        currentFrame = currentFrame + 1
+        
+        if (currentFrame > 6) then currentFrame = 0 end
+        
+        frameRec.x = currentFrame*guybrush.width/7
+    end
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        DrawTexture(guybrush, 35, 40, WHITE)
+        DrawRectangleLines(35, 40, guybrush.width, guybrush.height, LIME)
+        
+        DrawTextureRec(guybrush, frameRec, position, WHITE)  -- Draw part of the texture
+        
+        DrawRectangleLines(35 + frameRec.x, 40 + frameRec.y, frameRec.width, frameRec.height, RED)
+        
+        DrawText("PRESS RIGHT KEY to", 540, 310, 10, GRAY)
+        DrawText("CHANGE DRAWING RECTANGLE", 520, 330, 10, GRAY)
+        
+        DrawText("Guybrush Ulysses Threepwood,", 100, 300, 10, GRAY)
+        DrawText("main character of the Monkey Island series", 80, 320, 10, GRAY)
+        DrawText("of computer adventure games by LucasArts.", 80, 340, 10, GRAY)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(guybrush)       -- Texture unloading
+
+CloseWindow()                 -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------