net/mosquitto: Import 1.3.1 from packages

This is actively maintained, and will continue to be maintained.

Upstream development versions of the package is available at
https://github.com/remakeelectric/owrt_pub_feeds

Signed-off-by: Karl Palsson <[email protected]>

Fix README

Add libcap and mdnsresponder

Update README, add guidelines

Update README

Add README