Update README.md

Author: tomchristie

Diff for: README.md

@@ -1,3 +1,15 @@
+# The Encode website
+
+This is the source for the www.encode.io website.
+
+It is built with Jekyll and hosted on GitHub pages.
+
+### Installing Jekyll on a Mac
+
+* `brew install ruby`  *Ensure we have an up to date ruby environment.*
+* Update `PATH` in `~/.bash_profile` to include the brew installed ruby bin directory.
+* `gem install bundler jekyll`
+
 ### Serving the documentation locally
 
 ```shell