add cl-timer_rc explanation

docs/pages/documentation.html

@@ -32,6 +32,7 @@ <h1>CL Timer Documentation</h1>
                     <p>Once you are in a session, press ":" to enter command mode. To exit command mode, press the escape key.</p>
                     <p>You can use double-quotes &#40;<code>""</code>&#41; to enclose string with spaces in them.</p>
                     <p>You can use semicolons &#40;<code>;</code>&#41; to separate multiple commands in one line.</p>
+                    <p>On installation, a hidden file called cl-timer_rc will be created in your home directory. Each line in this file will be executed as a command on opening of cl-timer. You can use this for aliases, default settings, and really anything you want.</p>
                 </div>
                 <div id="commands">
                     <h2>Commands</h2>