Add README.cups.md

[glensc]

Imported from Wiki: Initial Home page:

• https://github.com/libfuse/python-fuse/wiki/Home/56ebc18df60829a3c14ae304d5a74f27d9b06680

Closes:

• https://github.com/libfuse/python-fuse/issues/54

[glensc]

@sdelafond can you comment early on naming things (filenames)? so it's less work to be done to rename with git rebase.

[sdelafond]

Let's do away with the capital letters right now, I propose cups.py and README.cups.md.

[glensc]

@sdelafond looks good from my side.

[sdelafond]

Thanks a lot!