Article on wrapping C libraries in Nim

[elcritch]

P.S. @adokitkat if you can get Futhark to run and cache results I'd be up for 
swapping that layer of Nesper out. Unless you're just wanting to make a new 
project. I just prefer using c2nim / cimporter since I like to have human 
readable wrappers and I think Futhark tends towards all-in-one files.