migrate "COATJAVA Developer Docs" wiki to this repo

[c-dilks]

Move contents of https://clasweb.jlab.org/wiki/index.php/COATJAVA_Developer_Docs#tab=Overview to here, e.g., to docs/.

Keeping the documentation closer to the code should help better prevent the documentation from falling behind (not saying that it is behind, rather this is a preventative maintenance idea).

[baltzell]

This could be a dedicated service work task.

[baltzell]

And, cloudflare is now blocking write access to some jlab wikis ...