In the "Deloper Guide" page it was added a new section - "Prerequisites".
New subsection called "OSGi" is created. In the subsection a new pages
is added - "Overview".
The page is aimed to help developers, that are
going to use OSGi for the first time.
Signed-off-by: Svilen Valkanov, svilen.valkanov@musala.com
(github: svilenvul)