Add params file docs to usage.md in template

[jfy133]

To address issues as discussed in: https://nfcore.slack.com/archives/CE6SDBX2A/p1674599225438509

Text is copied from @d4straub 's text in nf-core/ampliseq with minor modifications and extensions.

I've also tagged myself as contributors, to start that tradition as discussed in the maintainers channel (so each release CHANGELOG shows who contirbuted)

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[github-actions]

This PR is against the master branch ❌

• Do not close this PR
• Click Edit and change the base to dev
• This CI test will remain failed until you push a new commit

---

Hi @jfy133,

It looks like this pull-request is has been made against the nf-core/tools master branch.
The master branch on nf-core repositories should always contain code from the latest release.
Because of this, PRs to master are only allowed if they come from the nf-core/tools dev branch.

You do not need to close this PR, you can change the target branch to dev by clicking the "Edit" button at the top of this page.
Note that even after this, the test will continue to show as failing until you push a new commit.

Thanks again for your contribution!

[jfy133]

@nf-core-bot fix linting

[codecov]

Codecov Report

Merging #2173 (579a0c3) into dev (9ca438b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2173   +/-   ##
=======================================
  Coverage   71.49%   71.49%           
=======================================
  Files          77       77           
  Lines        8378     8378           
=======================================
  Hits         5990     5990           
  Misses       2388     2388           

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[d4straub]

LGTM!