Add CLAUDE.md with project notes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: henrik242

CLAUDE.md

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+## Build
+
+    $ xcodebuild -project Cocoa\ CapsBeeper.xcodeproj
+
+## Notes
+
+- Deployment target is macOS 13.0+ (required for SMAppService)
+- The Objective-C API is `SMAppService.mainAppService`, not `mainApp` — the latter is the Swift-only name (via `NS_SWIFT_NAME`)
+- The app name "Cocoa CapsBeeper" appears in many places: project.pbxproj, Info.plist, InfoPlist.strings, MainMenu.nib, AppController.m, build.yml, and the xcodeproj directory name itself
+- Homebrew formula lives in https://github.com/henrik242/homebrew-brew