Add page.image example post

Author: mmistakes

example/_posts/2010-01-08-post-image.md

@@ -0,0 +1,18 @@
+---
+title: "Post: Image"
+image: /images/so-simple-sample-image-3.jpg
+categories:
+  - Post Formats
+tags:
+  - content
+  - image
+last_modified_at: 2019-01-08T08:50:52-05:00
+---
+
+This post should display a large image at the top of a page.
+
+```yaml
+image: /images/so-simple-sample-image-3.jpg
+```
+
+Tall images will push content down the page. `1600 x 600` is a good middle-ground size to aim for.