docs: refresh README

[ChiragAgg5k]

Refreshes the README with the rewritten getting-started guide and corrected badges, links and install steps from appwrite/sdk-generator#2077 and appwrite/appwrite#14613.

README files only. No code, version or changelog changes, so this does not need a release.

[hansi-codes]

🟢 Tier S · Ready to merge

The incremental documentation change accurately describes the push subscription handle and introduces no actionable issues.

Refreshes README installation guidance and the getting-started content, including client setup, requests, OAuth, Java usage, typed models, and push notifications. It also updates badges and documentation links, and clarifies the lifetime of push subscriptions.

Latest changes: The newest commit removes the immediate unsubscribe call from the push example and explains that callers should retain the subscription and unsubscribe when they stop listening, such as in onDestroy().

Verdict	New comments	Fixed	Still open
✅ Approved	0	0	0

📂 Walkthrough · 1

File	Change
README.md	Updates badges, links, installation instructions, getting-started examples, and push-notification guidance; the latest change clarifies when to retain and unsubscribe a push subscription.

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[hansi-codes]

🟢 Tier S · Looks good to merge. Summary