Initialize minimal Obsidian plugin repository with required files

[usernum79]

Set up a minimal repository structure for an Obsidian plugin, including:

1. main.js: JavaScript file with a basic plugin class definition for Obsidian.
2. manifest.json: Minimal valid manifest for an Obsidian plugin.
3. Readme.md: Brief description outlining plugin purpose and installation instructions.

This serves as a starting point for developing an Obsidian-compatible plugin.