Add instructions to README on how to create a new blog post

Author: rondy

README.markdown

@@ -2,11 +2,29 @@
 
 It is automatically transformed by [Jekyll](http://github.com/mojombo/jekyll) into a static site.
 
+## Contributing with the blog
+
+  Create a new file inside `_posts/YYYY-MM-DD-post-title.markdown` following the template:
+
+    ---
+    layout: post
+    title:
+    author:
+    category:
+    excerpt:
+    ---
+
+    Body text goes here...
+
+  Or use `_bin/newpost` to bootstrap a new post file:
+
+    export EDITOR=vim; _bin/newpost 'Post title'
+
 ## License
 
 * The Elixir logo and website contents are copyrighted to [Plataformatec](http://plataformatec.com.br/).
 You may not reuse anything therein without permission.
 
 * The HTML and CSS are copyrighted to [AlienWp](http://alienwp.com/) under [GPL license, version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html).
 
-* The Social Icons are copyrighted to [Xeloader](http://xeloader.deviantart.com/art/Socialis-2-Freebie-213292616).
+* The Social Icons are copyrighted to [Xeloader](http://xeloader.deviantart.com/art/Socialis-2-Freebie-213292616).