Add usage

README.md

@@ -4,3 +4,27 @@ mojolingo/asterisk
 ==================
 
 This module provides functions to manage Asterisk packages.
+
+Usage
+-----
+
+If you are are using [Librarian-puppet](https://github.com/rodjek/librarian-puppet) then add this to your Puppetfile:
+
+```Ruby
+mod "puppetlabs/apt"
+mod "mojolingo/asterisk", :git => "git://github.com/mojolingo/puppet-asterisk.git"
+```
+
+Then run `librarian-puppet update`
+
+To install Asterisk 1.8 from the Digium repositories add this to your Puppet manifest:
+
+```Puppet
+include asterisk
+```
+
+Caveats
+------
+
+This module currently only supports Debian and Ubuntu.
+