Add sphinx for docs generation: add Sphinx as dependency requirement [#34]
Add sphinx for docs generation: sphinx-quickstart [#34]
Add sphinx for docs generation: installs Sphinx as system wide python package [#34]
Add sphinx for docs generation: add content [#34]
Add sphinx for docs generation: add more content [#34]

+ add ``join and work with us`` section to ``intro.rst``
+ add content to ``getting_started.rst``
Merge remote-tracking branch 'hoatle/feature_34_add_sphinx' into develop