Added brief plugin section to this document

git-svn-id: https://subversion.xor.aps.anl.gov/synApps/areaDetector/trunk@7735 dc6c5ff5-0b8b-c028-a01f-ffb33f00fc8b

documentation/areaDetectorDoc.html

@@ -1648,6 +1648,16 @@ epicsSnprintf(
     <p>
       <b>ADBase.adl</b></p>
     <img alt="ADBase.png" src="ADBase.png" /></div>
+  <h2 id="Plugins">
+    Plugins</h2>
+    areaDetector supports <a href="pluginDoc.html">plugins</a>, which receive the array data from the drivers
+    and perform operations on the data.  These are documented separately:
+    <ul>
+      <li><a href="pluginDoc.html#NDPluginDriver">NDPluginDriver</a></li>
+      <li><a href="NDPluginStdArrays.html">NDPluginStdArrays</a></li>
+      <li><a href="NDPluginFile.html">NDPluginFile</a></li>
+      <li><a href="NDPluginROI.html">NDPluginROI</a></li>
+    </ul>
   <h2 id="Detector_drivers">
     Detector drivers</h2>
   <p>