Update README.md

[ongolaboy]

The previous command is ejabberd-centric. It's better to use the native one of prosody when creating a new user.

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[gpolitis]

I don't see anything ejabberd specific in the code that you're trying to modify but your version has the advantage that it doesn't require typing the password in cleartext on command line, potentially storing it in your history.

[ongolaboy]

Actually @gpolitis, here is what you have in the man of prosodyctl(1) , starts at line 126 https://hg.prosody.im/0.11/file/tip/man/prosodyctl.markdown#l126 .