Add badge indicating nf-core template version on main README

[jfy133]

We should add some automation to bump the version number on each template sync (but I'm not clever enough for that)

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]

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Hi @jfy133,

It looks like this pull-request is has been made against the nf-core/tools main branch.
The main branch on nf-core repositories should always contain code from the latest release.
Because of this, PRs to main 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!

[mirpedrol]

That's nice! But we should also add the logic to update it when running nf-core pipelines sync

[jfy133]

Sorry @mirpedrol ! This was a false start PR, right one is here:

#3396

And yes as per the OP I suggested we should have automation but I don't know how to od that unforutnately