Custom ULX Commands?

[iViscosity]

So I recently purchased a server and I'm pretty new to the whole coding scene, I know some basic Lua and I'm pretty good at html, but I need some help with making new commands (this is for gmod TTT btw).  Basically I want to make a command that when you type !workshop that will bring people to the workshop for our group so they can download everything in there, I already have a resources.lua but I excluded some of the larger files for downloading time reasons.  How would I be able to make a command that does that?