Anyone can contribute. To contribute, just edit README.md in your fork and make a pull request.
The easiest way to to this is to press the pencil button on the top right of README.md - add your resource, then follow through to make a pull request.
Formatting guides
- Add your resource in the format
[Resource Name](https://link.to/resource) - description of resource, no beginning capital letter/full stop
- Find the relevant section for your resource - if there are similar resources this may help, otherwise you can make your own section
- Put your resource (or new category) in alphabetical order