Store Notes as Markdown into folders with hierarchy

## **Concept**: Saving Notes and Metadata in a File-Based Structure

I really appreciate the idea of saving notes in a file-based hierarchy, specifically using Markdown files for the content. And saving all meta information related to each note in a hidden `.floaters`.

**Format for Meta Information**

To enhance interoperability and transparency, a standardized exchange format like JSON could help. This would allow both users and third-party applications to:

- easily view and understand the meta information (such as background color, transparency, monitor placement, group assignment, etc.),
- alter or update these settings manually if necessary.

**Indexing for Performance**

To avoid the need for Floaters to constantly scan all folders and files to often or in a way to short interval, a centralized indexing and catalog mechanism could be introduced into an lightweight SQL-based database file (placed in project root or offical "Documents" folder of MacOS).

This index would:

- keep track of all available Markdown notes and their associated meta files,
- categorize and locate floaters efficiently,
- minimize filesystem reads and improve the app's overall performance.

The choice of database format and structure should be flexible, depending on the developer's preferences.