Add “Core Spotlight” framework to make Notes indexable/visible to spotlight search

Priority: Low Background: A lot of users use spotlight search to lookup items on their phone/mac Feature Description: By incorporating Core Spotlight within your app, you can make notes indexable for spotlight Benefits/Rationale: Easy to lookup notes within Cleft app Potential Implementation: History Bookapp has great implementation to make offline saved pages searchable via spotlight search - here Impact: It would make notes within CleftNotes more accessible Additional Information: None