How to add and use new test dataset

Please fill in the appropriate checklist below (delete whatever is not relevant). These are the most common things requested when adding a new test dataset.

Check here that there isn't already a branch containing data that could be used
- If this is the case, follow the documentation on how to use an existing test dataset
Fork the nf-core/test-datasets repository to your GitHub account
Create a new branch on your fork
Add your test dataset
Make a PR on a new branch with a relevant name
Wait for the PR to be merged
Use this newly created branch for your tests