Adding email charter

Author: jhill1

coc.html

@@ -58,7 +58,8 @@ <h3>Flexible working hours</h3>
       timing of the email with respect to what the recipient needs
       to do, i.e. don't send an email at 17:59 which is needed for a 10:00 meeting the next day. 
       Automated emails, e.g. pull requests, github review request, etc. are fine at any time, but no lab members are 
-      required nor should feel obliged to reply to them outside of their typical work hours.</p>
+      required nor should feel obliged to reply to them outside of their typical work hours. See the <a href="http://www.emailcharter.org/">
+      Email Charter</a> for some helpful techniques to manage your email.</p>
 
       <p>If you experience any challenges related to flexible working within the lab please contact Jon Hill. 
 	All communication will be treated as confidential.</p>