Add docs folder

[niccokunzmann]

fixes #712

To Reproduce -> These commands work now. The docs are added.

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📚 Documentation preview 📚: https://icalendar--720.org.readthedocs.build/

[niccokunzmann]

@mgorny, I had a look and it turns out the fix is simple.

[coveralls]

Pull Request Test Coverage Report for Build 11306099255

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 97.315%

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Totals
Change from base Build 11199956195:	-0.07%
Covered Lines:	3190
Relevant Lines:	3273

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💛 - Coveralls

[mgorny]

Thanks!

[niccokunzmann]

@stevepiercy would you like to have a review look? You like the docs, too :)

[stevepiercy]

I like grammatically correct sentences using the past verb tense in change log notes, because after publication it will be in the past.

Also I like error messages to tell me both what the problem is and what explicit action I need to do next to resolve it.

Thanks for asking for my review.

[niccokunzmann]

@stevepiercy thanks for the review! I agree with the error messages being more of a guide.

When it comes to the changelog. My reasoning behind present tense is this:

In some practice, commits are formulated in this way:
Apply this commit to [commit message]
.... Log changes
.... Add feature
.... Remove error
There, it is a bit imperative present tense. So, the changelog can be close to that but I really do not mind how people write their changelog as long as it is descriptive enough - very vague.

I value the contribution, contributions from a diverse background are divers. Asking to conform and make lots of changes might not be as inclusive when it comes to time invested voluntarily - that is my reasoning when it comes to external and first-time contributions.

In the team, we can agree on disciplines for us:)

Feel free to merge as I would not add anything... I just have to wait for 1 week to merge my own PR.

[stevepiercy]

LGTM. Thanks for the explanation of change log policy.