Allow other types of readme files

[s-spindler]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

At the moment only rst and md is supported for README files. Both make sense but the limitation seems arbitrarily restrictive. For example, ascii-doc is used by many organizations as their default markup language.

GitHub itself seems to support a wide variety of markups: https://github.com/github/markup/blob/master/README.md#markups

Since the generated readme file is empty anyway I see no reason why a user shouldn't be allowed to pass the file extension like so:
poetry new --readme adoc

[eyllanesc]

@s-spindler I think that the limitation is due to pypi that only supports rst and md.

[s-spindler]

@eyllanesc You're right, those two are supported. A third option is plaintext: https://packaging.python.org/en/latest/guides/making-a-pypi-friendly-readme/#creating-a-readme-file
So it's not like pypi forbids other markups, it just doesn't render them.

I would still give users the choice. Not everyone uses pypi (e.g. company internal projects that are put in artifactory).

[github-actions]

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