Document notification settings and snooze API endpoints

[robzolkos]

Summary

• Add sections/notification_settings.md documenting three new API endpoints from basecamp/bc3#9931:
  • GET /my/notifications/settings.json — read notification preferences
  • PUT /my/notifications/settings.json — partial update with enum validation
  • PUT /my/notifications/snooze.json — snooze notifications for a duration
• Add "Notification settings" to the README endpoint index

[Copilot]

Pull request overview

Adds documentation for the newly introduced “Notification settings” API surface, and links it from the main README so it’s discoverable alongside other endpoint docs.

Changes:

• Added sections/notification_settings.md documenting notification settings read/update and snooze endpoints.
• Added the new “Notification settings” entry to the README API endpoint index.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sections/notification_settings.md	New documentation for notification preferences endpoints, including request/response examples and parameter descriptions.
README.md	Adds the “Notification settings” section to the API endpoints list for discoverability.

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