re-added gestion for plugins volume outside folder

README.md

@@ -1,4 +1,6 @@
 
+### to start :
+
 this repo uses submodule fo `env_generator`, so after cloning you need to do :
 ```
 git submodule init
@@ -9,3 +11,14 @@ or
 git submodule update --init --recursive
 ```
 
+### PLUGINS :
+
+- this wordpress container allow you to have a plugins repository outside of
+- by default it's in the parent repo :
+	- parent-repo/
+		- stuff..
+		- plugins/
+		- wordpress_docker/
+			- stuff..
+- you can change its location inside `model.env`
+- this plugin repository is a volume, so changes inside of it takes immediat effect