added documentation of hcs-incoming and friends

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+[[!meta title="HCS Incoming"]]
+
+To foster communication between SIPB and our counterpart at Harvard,
+[the Harvard Computer Society (HCS)](http://www.hcs.harvard.edu/),
+some enterprising SIPB members have set up a Moira list that is
+subscribed to some of HCS's interesting public and semi-public mailing
+lists.  In other words, this means that SIPB members can receive HCS
+mail without having to go through the HCS Mailman system.
+
+* **hcs-incoming** - subscribed to **hcs-discuss** and **hcs-announce**
+
+* **hcs-incoming-systems** - subscribed to **hcs-systems**
+
+* **hcs-incoming-projects** - subscribed to **hcs-projects**
+
+* **hcs-incoming-all** - this list is a member of **hcs-incoming**, **hcs-incoming-systems**, and **hcs-incoming-projects**. Add yourself to this if you want to receive any and all HCS mail.
+