Contributing to 'Luminescence' is simple and straightforward.

Workflow

Create a fork of the 'Luminescence' repository
Create your own branch with a name like feature_<your feature>, fix_<your fix> or new_<your new function>
Implement your changes
Push the branch with your changes to your fork
Create a pull request against the master branch of the 'Luminescence' repository
A series of tests will start automatically: they should all turn green before merging is allowed; if not you'll have to fix the problems or have a very good explanation why this is not possible
Make your way through the review process
... your contribution gets merged

Ground rules

You pledge to abide by our code of conduct
Your contribution should be significant: if you just want to see a typo fixed, it may be faster to open an issue instead
We expect your code to follow the general package design and structure (we'll help you with that during the review process)
Your code must follow the CRAN policy

In case you have questions, please contact the package maintainers before creating a pull request.