Add missing documentation

[Packsolite]

This project currently does not include any documentation. Adding documentation would help contributors and users better understand how to set up, use, and contribute to the project.

Suggested Improvements:

• Add a README.md with an overview of the project, setup instructions, usage examples, and contribution guidelines.
• Include installation steps and prerequisites.
• Document key components of the codebase (e.g., via inline comments or a separate docs/ folder).
• Optionally add a CONTRIBUTING.md and a LICENSE file for clarity.

Having proper documentation would improve the project's accessibility and encourage more community involvement.

[zcg]

https://deepwiki.com/emilycares/java_lsp