Add raylib lua examples

examples/models_billboard.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [models] example - Drawing billboards
+--
+--  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 [models] example - drawing billboards")
+
+-- Define the camera to look into our 3d world
+local camera = Camera(Vector3(5.0, 4.0, 5.0), Vector3(0.0, 2.0, 0.0), Vector3(0.0, 1.0, 0.0), 45.0)
+
+local bill = LoadTexture("resources/billboard.png")     -- Our texture billboard
+local billPosition = Vector3(0.0, 2.0, 0.0)             -- Position where draw billboard
+
+SetCameraMode(CAMERA.ORBITAL)      -- Set an orbital camera mode
+SetCameraPosition(camera.position) -- Set internal camera position to match our camera position
+SetCameraTarget(camera.target)     -- Set internal camera target to match our camera target
+SetCameraFovy(camera.fovy)         -- Set internal camera field-of-view Y
+
+SetTargetFPS(60)                   -- Set our game to run at 60 frames-per-second
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    UpdateCamera(&camera)          -- Update internal camera and our camera
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        Begin3dMode(camera)
+        
+            DrawBillboard(camera, bill, billPosition, 2.0f, WHITE)
+            
+            DrawGrid(10, 1.0f)        -- Draw a grid
+
+        End3dMode()
+
+        DrawFPS(10, 10)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(bill)        -- Unload texture
+
+CloseWindow()              -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------