Add API documentation for my notifications endpoint

[robzolkos]

Summary

• Documents the GET /my/readings.json endpoint as "My notifications" — the API behind the Hey! menu
• Documents the PUT /my/unreads.json endpoint for marking notifications as read
• Adds "My notifications" to the README endpoint index

[Copilot]

Pull request overview

Adds a new documentation section for the “My notifications” API (the endpoints backing Basecamp’s “Hey!” menu), and links it from the main README endpoint index.

Changes:

• Added sections/my_notifications.md documenting GET /my/readings.json and PUT /my/unreads.json.
• Added “My notifications” to the README endpoint index.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
sections/my_notifications.md	New endpoint documentation for listing notifications and marking them read, including example payloads/cURL.
README.md	Adds “My notifications” to the API endpoint index.

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