Add readme for GitHub

README.md

@@ -0,0 +1,19 @@
+This repository contains the source code for the SlimeKnights Developer Documentation. Upon new commits, it will automatically update the site at  https://slimeknights.github.io/.
+
+This site is coded using [Jekyll](https://jekyllrb.com/) with the [minima v2.5](https://github.com/jekyll/minima/tree/2.5-stable) theme
+
+## Contributing
+
+If you wish to contribute to development of the SlimeKnights documentation, you can do a lot of it directly using the editor on GitHub. However, the best way would be to clone the repository locally, then install Jekyll to allow you to preview your changes on a local site before committing or making a pull request.
+
+To do this, first follow the instructions to [install Jekyll and Bundler](https://jekyllrb.com/docs/installation/) on your system. Assuming you already have Ruby installed, this should be as simple as
+
+```
+gem install jekyll bundler
+```
+
+Once Jekyll and Bundler are installed, you can launch the website using
+```
+bundle exec jekyll serve
+```
+Which will make it available at http://localhost:4000.

_config.yml

@@ -65,3 +65,6 @@ header_pages:
 #   - vendor/cache/
 #   - vendor/gems/
 #   - vendor/ruby/
+
+exclude:
+  - README.md