add more details to README.md

[LilyAnderssonLee]

Description

Add some details to README.md

Preparations:

N/A

How to test:

Run in a tmux screen or similar if testing on a large dataset.
N/A

Expected outcome:

• [] Produced files contain expected values
  N/A

Review:

• Code reviewed by

PR checklist

Closes #XXX

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If necessary, include test data in your PR.
• Follow the input/output options guidelines.
• Add a resource label
• Use BioConda and BioContainers if possible to fulfil software requirements.
• Ensure that the test works with either Docker / Singularity. Conda CI tests can be quite flaky:
  • PROFILE=docker pytest --tag <MODULE> --symlink --keep-workflow-wd --git-aware
  • PROFILE=singularity pytest --tag <MODULE> --symlink --keep-workflow-wd --git-aware
  • PROFILE=conda pytest --tag <MODULE> --symlink --keep-workflow-wd --git-aware

[LilyAnderssonLee]

It's good!