Add installation notes to readme.

README

@@ -9,6 +9,18 @@ It was heavily inspired by "Jeremy Voorhis'/Geoffrey Grosenbach's calendar_helpe
   * Where the calendar_helper had one helper method that internally called multiple other private methods, LaterDude keeps the namespace clean by tucking away all of its functionality in a presenter (of sorts).
   * Most CSS class names are given implictly, e.g. "day", "weekendDay" (both are given to the displayed month as well as to the previous and following month), "otherMonth" (all days that don't belong to the displayed month) and "today". The only CSS class that can be configured is the table's class (which defaults to "calendar"). Further customization can be taken care of by passing a block (see examples).
 
+Installation
+============
+
+You can use LaterDude either as a gem (preferred) or as a Rails plugin.
+
+To use the gem version, put the following gem requirement in your environment.rb:
+
+  config.gem "later_dude", :source => 'http://gemcutter.org'
+
+To install it as a plugin, fire up your terminal, go to your Rails app and type:
+
+  $ ruby script/plugin install git://github.com/clemens/later_dude.git
 
 Examples
 ========