Set a custom status message

[msisskin]

• Your Rocket.Chat Experimental app version: 1.7.0
• Your Rocket.Chat server version: 2.3.1
• Device (or Simulator) you're running with: iOS/Android

Users cannot set a custom status message on mobile like they can in the browser.

[diegolmello]

@msisskin it's not implemented yet. Some work was made on #1176

[aashaypalliwar]

I wish to work on this. Thanks!

[diegolmello]

@aashaypalliwar No need to ask. Just open a PR and we'll be happy to review it. Thanks.

[foss-]

This is now #1811 and it's looking great. Currently in "Need Review" state. Hope RC team can find the time for review soon.