added post layout

_layouts/post.html

@@ -0,0 +1,14 @@
+---
+layout: default
+---
+
+<small>{{ page.date | date: "%-d %B %Y" }}</small>
+<h1>{{ page.title }}</h1>
+
+<p class="view">by {{ page.author | default: site.author }}</p>
+
+{{content}}
+
+{% if page.tags %}
+  <small>tags: <em>{{ page.tags | join: "</em> - <em>" }}</em></small>
+{% endif %}