Update README.md

README.md

@@ -24,6 +24,13 @@ This tilesets don't have a dedicated function and should only be used as deco.
 ### mullana tilesets
 see [Readme-Mullana-Tilesets.pdf](Readme-Mullana-Tilesets.pdf)
 
+## Community Tilesets
+You need to initialize the submodules first.
+
+`git submodule init`
+
+`git submodule update --remote`
+
 ### community/cert
 We provide well 250 sorted sprites from mate crates to a security kit for your very own assembly map ;)
 Please take a look at its own README.md for more informations.