RFR: add README.md

[Andrei Rybak]

On Sat, 23 Mar 2024 12:23:20 GMT, Andrei Rybak <duke at openjdk.org> wrote:

> Welp, I guess the mailing list is not read by anyone, who can respond to this pull request. Closing.

For reference:

- first email to the mailing list in August 2023: bot's notification about opening of the PR – https://mail.openjdk.org/pipermail/duke-dev/2023-August/000004.html
- in January 2024, I sent an email "GitHub repository improvement - looking for a reviewer/sponsor" – https://mail.openjdk.org/pipermail/duke-dev/2024-January/000009.html
- Last two emails about closing of the pull request: <https://mail.openjdk.org/pipermail/duke-dev/2024-March/000011.html> and <https://mail.openjdk.org/pipermail/duke-dev/2024-March/000012.html>

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PR Comment: https://git.openjdk.org/duke/pull/2#issuecomment-3097974802