Adding information about private repos to the README

Author: jklein

README.md

@@ -66,6 +66,16 @@ Currently Hound is only tested on MacOS and CentOS, but it should work on any *n
 
 Right now Hound supports git and mercurial, and SVN support is being added.
 
+## Private Repositories
+
+There are a couple of ways to get Hound to index private repositories:
+
+* Use the `file://` protocol. This allows you to index any local folder, so you can clone the repository locally 
+and then reference the files directly. The downside here is that the polling to keep the repo up to date will
+not work.
+* Use SSH style URLs in the config: `"url" : "[email protected]:foo/bar.git"`. As long as you have your 
+[SSH keys](https://help.github.com/articles/generating-ssh-keys/) set up on the box where Hound is running this will work. There is currently an [issue](https://github.com/etsy/Hound/issues/19) with URLs in this case that we hope to fix soon.
+
 ## Editor Integration
 
 Currently the following editors have plugins that support Hound: