Adding docs on how to use Jekyll

Author: Evan Lovely

README.md

@@ -1,3 +1,41 @@
 # [Drupal Pattern Lab Website](http://drupal-pattern-lab.github.io)
 
-This is using GitHub pages; just push to publish.
+This is using [GitHub pages](https://pages.github.com); just push to publish.
+
+To contribute, many pages can be simply added and edited using the GitHub UI - this is encouraged as it's quicker for many.
+
+# Docs
+
+- [Jekyll](https://jekyllrb.com/docs/home/)
+- [GitHub Pages](https://help.github.com/categories/customizing-github-pages/)
+- [Viewing Jekyll build error messages](https://help.github.com/articles/viewing-jekyll-build-error-messages/#viewing-jekyll-build-failure-messages-in-your-repository)
+
+# Working Local
+
+If one is working on the theming or any new features that needs double-checking on how Jekyll compiled it, it's encouraged to spin this up locally and test. It's easy!
+
+## Requirements
+
+- `bundle` - Ruby Dependency Manager (install with `gem install bundler` - may require `sudo`)
+
+## Setup
+
+```bash
+bundle install
+```
+
+## Usage
+
+Compile, serve, & watch:
+
+```bash
+bundle exec jekyll serve
+```
+
+Open <http://127.0.0.1:4000>
+
+Other commands:
+
+```bash
+bundle exec jekyll --help
+```