Add installation instructions in case you don't have superuser access

There is the following text at the top of https://mosh.org:

You don't need to be the superuser to install or run Mosh

However it is unclear how to install mosh on server if you don't have root rights.

Could you, please, add instructions about installing mosh without root access. I think for now it can be just for one popular distribution, for exampe ubuntu.

Something like this gist: https://gist.github.com/xiaom/8264691 (code from gist doesn't work now, but there are some useful notes in comments, I think it would be very cool if you will accumulate these notes and publish remade gist on your site).

Thanks for excellent tool!

Commencez par le texte d’installation du site web de Mosh et examinez le gist lié, y compris ses commentaires, afin d’y trouver des approches qui fonctionnent toujours sans root access. C’est terminé lorsque le site explique une procédure d’installation Ubuntu testée pour les utilisateurs sans superuser access.