Add raylib lua examples

examples/textures_image_loading.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [textures] example - Image loading and texture creation
+--
+--  NOTE: Images are loaded in CPU memory (RAM) textures are loaded in GPU memory (VRAM)
+--
+--  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 [textures] example - image loading")
+
+-- NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+
+local image = LoadImage("resources/raylib_logo.png")  -- Loaded in CPU memory (RAM)
+local texture = LoadTextureFromImage(image)           -- Image converted to texture, GPU memory (VRAM)
+
+UnloadImage(image)   -- Once image has been converted to texture and uploaded to VRAM, it can be unloaded from RAM
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    -- TODO: Update your variables here
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        DrawTexture(texture, screenWidth/2 - texture.width/2, screenHeight/2 - texture.height/2, WHITE)
+
+        DrawText("this IS a texture loaded from an image!", 300, 370, 10, GRAY)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(texture)       -- Texture unloading
+
+CloseWindow()                -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------