Treat __init__.py (or docstring form __init__.py) as README file if README file does not exist
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal Currently, GitLab shows the content of README file in the web interface of a directory. That is a great and very useful feature! In the case of developing the python packages, the common practice is writing the documentation for the packages and sub-packages in docstrings of `__init__.py`. I hereby propose the GitLab developers to consider showing the content of `__init__.py`, or, if possible, the content of its docsting, as a README, if README file is not present in the folder. The same approach can be adopted with other programming languages, but nothing comes into my mind now. <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> <!-- Consider adding related issues and epics to this issue. You can also reference the Feature Proposal Template (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Feature%20proposal.md) for additional details to consider adding to this issue. Additionally, as a data oriented organization, when your feature exits planning breakdown, consider adding the `What does success look like, and how can we measure that?` section. -->
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