Added widget preview image. NOTE: This image should be replaced by a custom graphic.

Change-Id: Icbd475908314b3b310db0bc8022e53dda931ac88
diff --git a/res/drawable/preview.png b/res/drawable/preview.png
new file mode 100644
index 0000000..f05710f
--- /dev/null
+++ b/res/drawable/preview.png
Binary files differ
diff --git a/res/xml/bookmarkstackwidget.xml b/res/xml/bookmarkstackwidget.xml
index 1879923..56e7351 100644
--- a/res/xml/bookmarkstackwidget.xml
+++ b/res/xml/bookmarkstackwidget.xml
@@ -20,5 +20,6 @@
     android:minWidth="146dip"
     android:minHeight="146dip"
     android:updatePeriodMillis="3600000"
+    android:previewImage="@drawable/preview"
     android:initialLayout="@layout/bookmarkstackwidget">
 </appwidget-provider>