Adding tutorial to submodules

README.md

@@ -17,6 +17,12 @@ Run with:
 
     git clone https://github.com/gsi-upm/senpy-plugins-community.git
     senpy -f senpy-plugins-community
+# Loading new plugins to gitlab
+
+You should have two repos, one with data files and the main repo of the plugin. 
+First you have to push all the data files in the data repo and the code of the plugin in the main repo. Next, you have to "link" the two repos using submodule:
+
+    git submodule add ../data/<NAME OF YOUR PLUGIN> ./data
 
 # LICENSE