docs(overmind-devtools): document overmind-devtools for easier local development

[dpraimeyuu]

This tiny PR starts documentation around devtools - main principles behind it, how to contribute and set up it locally.

Thanks to @henri-hulski, I was able to run it and even play with it a bit.

NOTE: I know it might be the wrong package to place such docs, but firstly I wanted to document the knowledge and then later discuss whether it's a right location 😅

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[henri-hulski]

Looks good to me.
Maybe use "docs" instead of "chore" in the commit message.

[dpraimeyuu]

@henri-hulski yup, that totally makes sense!

Did you mean PR name or commit name?

I renamed PR name.

[henri-hulski]

Actually I mean the commit name as it's used for the release notes.

[henri-hulski]

You can fix it with

git commit --amend
git push --force

[dpraimeyuu]

@henri-hulski commit renamed 😄

[henri-hulski]

Thanks! I will merge it.