Add doc to readme file

README.md

@@ -5,11 +5,49 @@ Adds buttons to launch custom python scripts in the User panel.
 
 ## Installation
 
-Clone and add it to blender via the preferences > addons panel.
+Download as zip and install via the preferences > addons panel
+or clone repository in blender addon folder.
 
 ## Usage
 
-Place your .py scripts in the shelves/ folder.
+Place your .py scripts in the `shelves/` folder with following folder structure:  
+
+`shelves / sidebar_tab_name / panel_name / button_name.py`
+
+Here is the dictionnary to put at the beginning of your code to have tooltip, icon 
+and variables inside a popup:
+
+```
+info = {
+    'icon' : 'SORTALPHA',
+    'description' : 'Rename active object in something',
+    'name' : 'Some name',
+    'enum' : {'value': '3', 'items': ['1', '2', '3', '4']},
+    'int' : 2,
+    'path' : '/temp',
+    'bool' : False,
+    'float' : 2.0,
+    'collection' : {'value': 'object', 'collection': 'Object'},
+}
+```
+
+
+To get yout variables in your code :
+
+`name = info['name']`
+
+The collection return the name, so to get an object :
+
+`ob = bpy.data.objects.get(info['collection']['value'])`
+
+
+<!-- You can put a json file named "settings.json" inside your panel folder for tagging the folder
+
+`{"tags" : ["td"]}` -->
+
+You can next filter by tags by clicking on the arrow icon
+
+Script file starting with '_' are hided by default, you can unhide them by unchecking the filter icon
 
 ## Support
 Use the issues tracker to report a bug.