Add Week Planner plugin

[rwirdemann]

I am submitting a new Community Plugin

Repo URL

Link to my plugin: https://github.com/rwirdemann/obsidian-week-planner

Release Checklist

• [ ] I have tested the plugin on
  • [ ] Windows
  • [x] macOS
  • [ ] Linux
  • [ ] Android (if applicable)
  • [ ] iOS (if applicable)
• [x] My GitHub release contains all required files
  • [x] main.js
  • [x] manifest.json
  • [x] styles.css (optional)
• [x] GitHub release name matches the exact version number specified in my manifest.json (Note: Use the exact version number, don't include a prefix v)
• [x] The id in my manifest.json matches the id in the community-plugins.json file.
• [x] My README.md describes the plugin's purpose and provides clear usage instructions.
• [x] I have read the tips in https://github.com/obsidianmd/obsidian-releases/blob/master/plugin-review.md and have self-reviewed my plugin to avoid these common pitfalls.
• [x] I have added a license in the LICENSE file.
• [x] My project respects and is compatible with the original license of any code from other plugins that I'm using.
• [x] I have given proper attribution to these other projects in my README.md.