Add a small documentation file about expiration

diff --git a/doc/rlm_expiration b/doc/rlm_expiration
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+Module to expire user accounts.
+
+This module can be used to expire user accounts. Expired users receive
+an Access-Reject on every authentication attempt. Expiration is based
+on the Expiration attribute which should be present in the check item
+list for the user we wish to perform expiration checks.
+
+
+
+Expiration attribute format:
+
+You can use Expiration := "23 Sep 2004" and the user will 
+no longer be able to connect at 00:00 (midnight) on September 23rd, 
+2004.  If you want a certain time (other than midnight) you can do 
+use  Expiration := "23 Sep 2004 12:00".
+The nas will receive a Session-Timeout attribute calculated to kick
+the user off when the Expiration time occurs.
+
+
+
+Example entry (users files):
+
+user1  Expiration := "23 Sep 2004"