Adding a .gitignore to an existing repo. Source to original link -> http://monkeyhacks.com/link/adding-a-gitignore-to-an-existing-repo

gitignore-add.md

First commit any outstanding code changes, and then, run this command:

git rm -r --cached

This removes everything from theindex, then just run:

git add

Commit it:

git commit -m ".gitignore is now working"

You can also remove individual files, if you don't want such a drastic approach:

git rm --cached filename