explain FAQ

static/faq.html

@@ -43,6 +43,14 @@
                 <a href="#faq">Frequently Asked Questions</a>
             </h1>
 
+            <p>This page contains answers to frequently asked questions about GrapheneOS. It's not
+            an overview of the project or a list of interesting topics about GrapheneOS. Many of
+            the answers would be nearly the same or identical for the latest release of the
+            Android Open Source Project. The goal is to provide high quality answers to some of
+            the most common questions about the project, so the developers and other community
+            members can link to these and save lots of time while also providing higher quality
+            answers.</p>
+
             <h2 id="table-of-contents">
                 <a href="#table-of-contents">Table of contents</a>
             </h2>