Updated tutorial_tilemap (markdown)

tutorial_tilemap.md

@@ -35,6 +35,23 @@ Sounds like a lot of requirements, so here's a screenshot that shows where every
 
 <p align="center"><img src="images/tile_example.png"></p>
 
+Continue adding all the tiles, adjust the offsets if needed (if you use multiple tiles in a single image) unless there is a sprite per each tile. Again, as always, remember they have to be centered and their names must be unique.
+
+<p align="center"><img src="images/tile_example2.png"></p> 
+
+###Collision
+
+To add collision to a tile, create a StaticBody2D child for each sprite. This is a static collision node. Then, as a child of the StaticBody2D, create a CollisionShape2D or CollisionPolygon. The later is recommended because it's easier to edit:
+
+<p align="center"><img src="images/tile_example3.png"></p> 
+
+Finally, edit the polygon, this will give the tile a collision. **Remember to use snap!**. Using snap will make sure collision polygons are aligned properly, allowing a character to walk seamlessly from tile to tile.
+
+<p align="center"><img src="images/tile_example4.png"></p> 
+
+Keep adding collisions to tiles untile we are done. Note that BG is just a BG so we don't care about it.
+
+<p align="center"><img src="images/tile_example5.png"></p>