Adding section about abuse

As per the recent discussion, this paragraph adds guidance about abusive
messages to reps and to mySociety staff.

templates/website/about-qa.html

@@ -76,6 +76,10 @@ <H3>Feedback</H3>
 <li><a href="#lavishpraise">WriteToThem really helped me. How can I help you back?</a></li>
 <li><a href="#coulddobetter">I’ve got a suggestion for improving WriteToThem</a></li>
 
+<H3>Conditions of use</H3>
+<li><a href="#abuse">What types of message are not allowed?</a></li>
+</ul>
+
 <H3>Code</H3>
 <li><a href="#doityourself">I have an idea for a service similar to  WriteToThem. How would I set it up? Can I use your software?</a></li>
 <li><a href="#embed">I’d like to use WriteToThem for a campaign. How do I do that?</a></li>
@@ -576,6 +580,24 @@ <h2>Feedback</h2>
 </dd>
 </dl>
 
+<h2>Conditions of use</h2>
+<dt><a name="abuse"></a>What types of message are not allowed?</dt>
+
+<dd>
+<p>See above for our guidance around using WriteToThem only to contact to your own representatives.</p>
+<p>Additionally, you may not use WriteToThem for sending messages that are abusive or threatening.</p>
+<p>You should not use the service to bombard a representative with several messages over a short period of time.</p>
+<p>On discovery of such usage we may, at our discretion, ban you from further use of WriteToThem.</p>
+<p>As with all mySociety services and activities, users of WriteToThem must abide by the organisation's <a href="https://www.mysociety.org/code-of-conduct/">Code of Conduct</a>.
+This code applies to all activity related to the service, including correspondence with mySociety staff.</p>
+<p>Where a user sends a message that is intended to harass, threaten, abuse or distress a member of mySociety staff,
+we will, at our discretion, cease communication. We may also ban the correspondent from future use of the site.</p>
+<p>Where a message is of particular concern, we will forward details of the correspondence to the police.</p>
+
+<p class="toplink"><a href="#top">top</a></p>
+</dd>
+</dl>
+
 <h2>Code</h2>
 
 <dl>