mention global gitignore

README.md

@@ -3,6 +3,8 @@
 That's what we're trying to build. Please contribute
 by [forking][fk] and sending a [pull request][pr].
 
+Here's a good **global** gitignore: <http://help.github.com/git-ignore/>
+
 For more information on gitignore: [gitignore(5)][g5]
 
 [fk]: http://help.github.com/forking/