Add Sleepr

[welcoMattic]

Types of Changes

What types of changes does your PR introduce? Put an x in all boxes that apply

• [x] New addition to list
• [ ] Fixing bug in existing item in list
• [ ] Removing item from list
• [ ] Changing structure (organization) of list

Proposed Changes

Sleepr is a menu bar app for macOS Ventura+ that brings back the sleep timer removed by Aplle since Ventura. Pure Swift/SwiftUI app. Free voucher on demand to be accepted on the list

PR Checklist

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• [x] I have read the CONTRIBUTING guide
• [x] I have explained why this PR is important
• [x] I have added necessary documentation (if appropriate)