docs: updated README with demo pull request note

[shreeshsivakumar1-blip]

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Documentation:

• Add a GitHub Pull Request demo note to the README

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR appends a GitHub Pull Request demo note to the project’s README by adding a blockquote line at the end.

File-Level Changes

Change	Details	Files
Add demo pull request note to README	Inserted three blank lines before the new note Added a blockquote with a check mark and demo description	README.md

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