Add docs page for thumbnail

diff --git a/docs/pages/thumbnail.md b/docs/pages/thumbnail.md
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+++ b/docs/pages/thumbnail.md
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+---
+title: Thumbnail
+description: Spruce up an image tag with our thumbnail style.
+---
+
+The thumbnail style adds padding and a box shadow to an image. To use it, just add the class `.thumbnail` to an image element.
+
+```inky
+<table class="thumbnail">
+  <tr>
+    <td><img src="//placehold.it/300x300" class="thumbnail" /></td>
+  </tr>
+</table>
+```