Documentation part 1

[priyanka-surana]

This starts the documentation by modifying README.md, docs/README.md, docs/usage.md and docs/parameters.md. It also creates the file docs/results.md

Documentation tries to replicate pipeline pages on nf-core website. Example: https://nf-co.re/rnaseq

PR checklist

• [x] 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 you've added a new tool - have you followed the pipeline conventions in the contribution docs
  • [ ] If necessary, also make a PR on the nf-core/variantcalling branch on the nf-core/test-datasets repository.
• [x] Make sure your code lints (nf-core lint).
• [ ] Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• [x] Usage Documentation in docs/usage.md is updated.
• [ ] Output Documentation in docs/output.md is updated.
• [ ] CHANGELOG.md is updated.
• [x] README.md is updated (including new tool citations and authors/contributors).

[muffato]

Looks good to me. Just one thing: you've stated that this PR creates docs/results.md and it's indeed empty. I guess that's because we don't have the actual variant-calling sub-workflows yet, so we don't know what outputs will be and where ?

[priyanka-surana]

Yes both output.md and results.md will be filled in as we go along with more subworkflows, this PR creates the necessary structure.