Describe workaround for cloning with long file names on Windows

[Marcono1234]

Relates to #3676

On Windows cloning the repository might fail with "Filename too long". This pull request adds a section to the README explaining how to solve this.

[Marcono1234]

Hmm git restore --source=HEAD :/ is suggested to me by Git after the checkout failed:

However, it does not seem to work. git status still reports changes afterwards.
Using git reset --hard works.

Have marked this pull request as draft for now, until it is clear what the proper command is (and have asked on StackOverflow about this).

[jurre]

Thanks @Marcono1234, this would be a great addition to the docs. None of the maintainers work on Windows so the contribution is very much appreciated, lmk if I can help in any way.

[Marcono1234]

I would like to wait a few days to get an answer on the StackOverflow question or from the Git for Windows maintainers whether git restore --source=HEAD :/ (as currently suggested by Git) is indeed the "correct" command and there is a bug in Git for Windows.
In case I don't receive a definite response there I will edit this pull request to recommend git reset --hard instead.

[jurre]

@Marcono1234 did you ever end up getting a reply? I'm happy to find someone internally at GitHub who can answer the q if not!

[Marcono1234]

I did receive a reply and with some delay on my side posted this issue to the Git mailing list. However, it probably takes some time until this is resolved, so the easiest solution might be to recommend git reset --hard for now (which I changed with the latest commit).

Sorry that I did not inform you about the progress.