Added Documentation for buildSync

Hello! My first commit here. I put together a reStructuredText file to
document buildSync. We just implemented this plugin and it took some
work to get it going! I took the time to document my findings, and also
fill in some placeholders for missing info! I hope you find it valuable.
:)
Show * literal, not '*' literal.
Merge pull request #12 from dechols/master

Added Documentation for buildSync