Add raylib lua examples

examples/shapes_basic_shapes.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [shapes] example - Draw basic shapes 2d (rectangle, circle, line...)
+--
+--  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 [shapes] example - basic shapes drawing")
+
+SetTargetFPS(60)       -- Set target frames-per-second
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- 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)
+        DrawRectangleGradient(screenWidth/4*2 - 90, 170, 180, 130, MAROON, GOLD)
+        DrawRectangleLines(screenWidth/4*2 - 40, 320, 80, 60, ORANGE)
+
+        DrawTriangle(Vector2(screenWidth/4*3, 80),
+                     Vector2(screenWidth/4*3 - 60, 150),
+                     Vector2(screenWidth/4*3 + 60, 150), VIOLET)
+
+        DrawTriangleLines(Vector2(screenWidth/4*3, 160),
+                          Vector2(screenWidth/4*3 - 20, 230),
+                          Vector2(screenWidth/4*3 + 20, 230), DARKBLUE)
+
+        DrawPoly(Vector2(screenWidth/4*3, 320), 6, 80, 0, BROWN)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+CloseWindow()        -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------