quick frontend (app): call `getReady` once connected to bridge: namespaces and encryption plugins are only retrieved once backend is ready, else they may not yet be available (can happen notably when the backend is start at the same time as the frontend, e.g. on Android).

You'll find install instructions in documentation (see doc/installation.rst).

If you need help, come the SàT official XMPP room: sat@chat.jabberfr.org or join us with a web browser via https://chat.jabberfr.org/converse.js/sat@chat.jabberfr.org