add library.json file to support esp32 target via Platformio

[mhaberler]

usage example: https://github.com/mhaberler/m5stick-mqtt/blob/qrcode/platformio.ini

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[Cyan4973]

Thank you for contributing, @mhaberler. Your solution likely works as intended. However, the upstream repository isn’t the place to support every package manager. We aim to keep the repository’s root directory free of special-case files and only add features we can reliably maintain over time.

In this case, a dedicated fork for PlatformIO would be ideal. That fork would include and maintain the additional file, updating it whenever a new release occurs. (For instance, the “version” field is still set to v1.5.5.)

[mhaberler]

fair enough.

I will keep it in my fork in the platformio branch and rebase as needed.