Add pre-release message to index.html

index.html

@@ -20,6 +20,12 @@
   <hr>
   <section class="content-center">
     <article id="main-article">
+      <!-- TODO: remove this before 1.0 release!  -->
+      <p>
+          ATTENTION: We are currently in an early public testing phase.
+          We'd appreciate it if you don't share this yet.
+          A full public release should follow very shortly.
+      </p>
       <p>
         This webpage will exploit your LG webOS smart TV, gain local root privileges,
         and install the <a href="https://github.com/webosbrew/webos-homebrew-channel">