Refactor gettingstarted.rst Java user guide, rewording text, changing headings to follow Python Doc standards, add lead-in blurb from MEGA README.
Refactor gettingstarted.rst Java user guide, rewording text, changing headings to follow Python Doc standards, add lead-in blurb from MEGA README.

meganz/sdk,Acidburn0zzz/sdk,Acidburn0zzz/sdk,PatrickJBaird/sdk,PatrickJBaird/sdk,meganz/sdk,meganz/sdk,Acidburn0zzz/sdk,meganz/sdk,PatrickJBaird/sdk,PatrickJBaird/sdk,Acidburn0zzz/sdk,meganz/sdk,Acidburn0zzz/sdk,Acidburn0zzz/sdk,PatrickJBaird/sdk,meganz/sdk,Acidburn0zzz/sdk,meganz/sdk,PatrickJBaird/sdk,Acidburn0zzz/sdk