ReadMe Improvement for Windows

Title: Clarify README for Windows

Description:
The README is confusing for Windows users and doesn't clearly explain how to use the tool. Simplifying and adding a few clear, step-by-step instructions for Windows would improve the user experience.

The README file is at the root of the repository. Review the current instructions, identify steps that are unclear for Windows users (e.g., installation, command execution, path handling), and rewrite them as simple, numbered steps. Test the new instructions on a Windows system to ensure they work. The change is complete when the README provides clear, actionable guidance for Windows users.

索引モデルが issue の本文から書いたものです。