Add raylib lua examples

examples/core_drop_files.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [core] example - Windows drop files
+--
+--  This example only works on platforms that support drag & drop (Windows, Linux, OSX)
+--
+--  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 [core] example - drop files")
+
+local count = 0
+--char **droppedFiles     -- ???
+
+SetTargetFPS(60)
+-------------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do    -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    if (IsFileDropped()) then droppedFiles = GetDroppedFiles(count) end
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        if (count == 0) then DrawText("Drop your files to this window!", 100, 40, 20, DARKGRAY)
+        else
+            DrawText("Dropped files:", 100, 40, 20, DARKGRAY)
+            
+            for i = 0, count do
+                if (i%2 == 0) then DrawRectangle(0, 85 + 40*i, screenWidth, 40, Fade(LIGHTGRAY, 0.5))
+                else DrawRectangle(0, 85 + 40*i, screenWidth, 40, Fade(LIGHTGRAY, 0.3)) end
+                
+                DrawText(droppedFiles[i], 120, 100 + 40*i, 10, GRAY)
+            end
+            
+            DrawText("Drop new files...", 100, 110 + 40*count, 20, DARKGRAY)
+        end
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+ClearDroppedFiles()    -- Clear internal buffers
+
+CloseWindow()          -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------