docs: Add note about using rich package

[peterdragun]

Based on the issue in esptool, I am adding a new section with known limitations mentioning rich issues and how to avoid the following: https://github.com/espressif/esptool/actions/runs/21666590745/job/62466876686

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[Copilot]

Pull request overview

Adds documentation about a known packaging limitation when building PyInstaller binaries that depend on rich, and provides a workaround via additional-args.

Changes:

• Introduces a new “Known Limitations” section in the README.
• Documents a PyInstaller workaround for rich Unicode data dynamic imports and shows the expected failure mode.

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[dobairoland]

LGTM. Thank you!