Add Acknowledgments section, as drafted by Janina.

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@@ -212,5 +212,9 @@ <h2>General Guidance on Implementing Accessibility Features of Collaborative Env
       <p>Note that learning an unfamiliar user interface is difficult or impossible for some people with learning or cognitive disabilities. Consequently, offering interoperability via an <abbr>API</abbr> with tools that are already familiar to the user  can remove otherwise insurmountable barriers to access in such cases.</p>
       </aside>
     </section>
+    <section class="appendix">
+	    <h2>Acknowledgments</h2>
+	    <p>The Accessible Platform Architectures Working Group gratefully acknowledges the vision and multi-year effort of our Research Questions Task Force (RQTF) in developing this publication. In addition we wish to acknowledge the contributions of all who provided comments and suggestions as this publication moved through multiple revisions. We especially thank members of our Cognitive and Learning Disabilities (COGA) Task Force for their particular diligence in comments and suggestions. Without COGA's help this publication would have been a far less formidable document.</p>
+    </section>
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