added how-to develop information

README.md

@@ -12,6 +12,19 @@ If you haven't done yet: download the latest jupyter-openbis-extension from pip.
 pip install --upgrade jupyter-openbis-extension
 ```
 
+or, if you would like to develop:
+
+```
+$ git clone git@sissource.ethz.ch:sispub/jupyter-openbis-extension.git
+$ cd jupyter-openbis-extension
+$ virtualenv venv
+$ source venv/bin/activate
+(venv) $ pip install -e .
+(venv) $ jupyter serverextension enable --py jupyter-openbis-extension
+(venv) $ jupyter nbextension install --py jupyter-openbis-extension --user --symlink
+(venv) $ jupyter nbextension enable jupyter-openbis-extension --user --py
+```
+
 **Register the Jupyter server extension** which will communicate both with openBIS and the notebook:
 
 ```
@@ -159,4 +172,4 @@ Known nbextensions:
     notebook section
       jupyter-openbis-extension/dialog  enabled 
       - Validating: OK
-```
\ No newline at end of file
+```