Minor: Add entry to xmpp.org / libraries

[Echolon]

Hey devs,

to advertise your project you could add an entry here: https://github.com/xsf/xmpp.org/blob/master/data/libraries.json

Optional: If you question what DOAP means: https://xmpp.org/extensions/xep-0453.html with a sample https://github.com/conversejs/converse.js/blob/master/conversejs.doap

Other than that: If you are looking for someone to review you issues and label them, I am happy to support. I did this for Jitsi, Monal and Converse already.

Kind regards

[Echolon]

@robbiehanson actually one would simple need to update the timestamp I just saw:

https://github.com/xsf/xmpp.org/blob/d9e3e6367412f008d57e236d3878cfe08ff5fca4/data/libraries.json#L711