Pyscho Stats for Gmod? (how to install?)

Could anyone help me install this addon mainly for css.
http://www.psychostats.com/

I really need it for my server. Please help!

Thanks in advanced!

Why would you need Psychostats for gmod…

A build combat server. Keep track of ranks.

You could do that with Lua…

I need someone to tell me how.

It needs to be the following:

When a player types “rank” in chat it bring up this info: time on server, number of kills, number of deaths, and their rank.

They can also type “top10” and it shows the top 10 ranks of people on the server.

Thanks in advanced anyone!