Added develop mode install on README.rst

Author: viniarck

README.rst

@@ -52,6 +52,13 @@ procedure:
    $ cd python-openflow
    $ sudo python3.6 setup.py install
 
+Alternatively, if you are a developer and want to install in develop mode:
+
+.. code-block:: shell
+
+   $ cd python-openflow
+   $ pip3.6 install -e .[dev] -e git://github.com/kytos/sphinx-theme.git#egg=kytos-sphinx-theme
+
 
 Basic Usage Example
 ===================