Add preliminary landing page, metadata, and collection.

Change-Id: If562fe440661d5157d953fcc3d13d4a53989d2b5
diff --git a/docs/html/preview/guide.jd b/docs/html/preview/guide.jd
index 56bb4d9..e768ba0 100644
--- a/docs/html/preview/guide.jd
+++ b/docs/html/preview/guide.jd
@@ -1,6 +1,7 @@
 page.title=Testing Guide
-page.image=images/cards/card-build_16x9_2x.png
-page.keywords=previewresources,androidm,testing,permissions
+page.image=images/cards/card-n-guide_2x.png
+meta.tags="preview", "testing"
+page.tags="preview", "developer preview"
 
 @jd:body