Add demo GIF to the app README

[JustinaPetr]

What does this change?

Adds a short demo GIF of Draft Queue to the app-client-starter-app README, under point 3 of "What it does". It shows the flow of connecting a Buffer account, picking a channel and adding a draft post, so readers can see the app before setting it up.

The GIF is stored at app-client-starter-app/docs/draft-queue-demo.gif (about 1 MB).

How was it tested?

Checked the README diff and the image path. The GIF is indented under point 3, so the list numbering stays intact.

Checklist

• No secrets, tokens or .env files are committed
• README updated
• No app code changed

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: 5dbb21c7-6937-424f-b837-6bc09a8720e3

📥 Commits

Reviewing files that changed from the base of the PR and between 66e56e8 and 12f98ba.

⛔ Files ignored due to path filters (1)

• app-client-starter-app/docs/draft-queue-demo.gif is excluded by !**/*.gif

📒 Files selected for processing (1)

• app-client-starter-app/README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Added a demo GIF illustrating account connection, channel selection, and drafting a post in Draft Queue.

Walkthrough

The README adds an embedded demo image showing account connection, channel selection, and the draft-post workflow.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 12f98

The README demo image is present at its referenced path, and no merge-blocking issue is established.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the README change.
Description check	✅ Passed	The description explains the change, test performed, GIF location, and checklist status. It does not include the template's npm test and npm run lint checkbox, but the description is otherwise complet…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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