docs: M Preview mini site skeleton

Change-Id: I308d9b50a7efc1b5f87b0647289f230aedcd5157
diff --git a/docs/html/preview/reference.jd b/docs/html/preview/reference.jd
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+++ b/docs/html/preview/reference.jd
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+page.title=Reference
+
+@jd:body
+
+<p>
+  The reference documentation and API difference report for the Developer Preview are available in
+  this downloadable package.
+</p>
+
+<ul>
+  <li>
+    <a href="http://storage.googleapis.com/androiddevelopers/preview/l-developer-preview-reference.zip">
+      M Developer Preview reference</a>
+  </li>
+</ul>
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