I think the link in your readme is wrong. I followed the instructions and the terminal (MacBook Pro 10.10.5) responded with:
"remote: Repository not found.
fatal: repository 'https://github.com/mpaarating/foundation-5-sublime-snippets.git/' not found"
I then used the link in the clone box: "https://github.com/mpaarating/atom-foundation-5-snippets.git"
The terminal responded:
"me$ git clone https://github.com/mpaarating/atom-foundation-5-snippets.git
Cloning into 'atom-foundation-5-snippets'...
remote: Counting objects: 20, done.
remote: Total 20 (delta 0), reused 0 (delta 0), pack-reused 20
Unpacking objects: 100% (20/20), done.
Checking connectivity... done."

The "atom-" is missing from the instructions.

However, now when I launch Atom I get this warning:

"Failed to load snippets from '/Users/me/.atom/packages/atom-foundation-5-snippets/snippets/snippet.cson'
/Users/me/.atom/packages/atom-foundation-5-snippets/snippets/snippet.cson: unexpected indentation"
Not sure whats that's about but I thought you should know about it.

Thanks