Assets: Add README.md about syncing

[ockham]

What?

Add a README.md to the assets/ directory, to document how it is synced to the plugin repository.

Follow-up to #68052. See #68052 (comment).

Why?

It's not that obvious.

How?

Add that README, plus the required provisions to exclude it from being synced to the plugin repo itself.

Testing Instructions

I've pushed this branch to my personal fork's trunk/. The README is found here; note that the workflow indeed hasn't been triggered by it.

[github-actions]

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Co-authored-by: ockham <[email protected]>
Co-authored-by: sirreal <[email protected]>
Co-authored-by: bph <[email protected]>

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[sirreal]

I would just sync this file too, it will be helpful on both ends. I doubt it will cause any issues.

[github-actions]

Flaky tests detected in 510e4e6.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/12412634829
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js
• [Flaky Test] submenu click on the arrow interactions #61884 in /test/e2e/specs/editor/blocks/navigation-frontend-interactivity.spec.js

[bph]

The review.md is a great solution. Thank yiu.

Once back from Year-end vacation, I will see if there is also a place in the block editor handbook to add additional documentation there especially about the blueprint for Playground.

[ockham]

I'll just leave this screenshot here in case we want to illustrate at some point what the approval screen looks like.

[ockham]

The sync workflow ran; the README was synced to svn 🎉