Update pyproject.md, describing the origin (not setting a readme) of Errno 21 and Errno 2

[AFirooz]

Describing the origin (not setting a readme) of "Errno 21" and "Errno 2".

Pull Request Check List

Resolves: #issue-number-here

• Added tests for changed code.
• Updated documentation for changed code.

[Secrus]

Could you provide some reproduction steps for the error you are describing? I don't think the team has ever heard of that case.

[AFirooz]

Yes sure, here is a reproduction of the problem.

# creating a temp dir to work in
tmpdir=$(mktemp -d -t 'poetry_tst.XXXXXXXXXX')
cd $tmpdir

# set pyenv if you have it installed, I'm using python version 3.10.13
# pyenv local 3.10.13

# testing poetry code
poetry init -q
# add some package
poetry add numpy
poetry install

You will notice that the output has this warning message, this message will also appear if README.md is in a parent directory (like a readme for a related bigger project):

The current project could not be installed: [Errno 2] No such file or directory: '/tmp/poetry_tst.XXXXXXXXXX/README.md'
If you do not want to install the current project use --no-root

Things that I tried:

1. Leaving the readme empty in pyproject.toml like readme = "". Output of poetry install:

Installing dependencies from lock file
No dependencies to install or update
Installing the current project: poetry-tst-bb4mmvspd8 (0.1.0)
[Errno 21] Is a directory: '/tmp/poetry_tst.BB4Mmvspd8'

2. Deleting the readme line completely from the pyproject.toml before adding a package and installing (This is a desired output). Output of poetry install:

Installing dependencies from lock file
No dependencies to install or update
Installing the current project: poetry-tst-bb4mmvspd8 (0.1.0)
/tmp/poetry_tst.BB4Mmvspd8/poetry_tst does not contain any element

3. Adding even an empty README.md file before running poetry install (This is also a desired output). Output of poetry install:

Installing dependencies from lock file
No dependencies to install or update
Installing the current project: poetry-tst-bb4mmvspd8 (0.1.0)
/tmp/poetry_tst.BB4Mmvspd8/poetry_tst does not contain any element

[dimbleby]

what you have written in the docs does not add anything to what the warning message already says

[radoering]

A agree with dimbleby. Nevertheless, thanks for your contribution.

[github-actions]

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