feat: Add Content Security Policy and update README

[mihnin]

This commit introduces two main changes:

1. Content Security Policy (CSP): Implemented a CSP in src/index.js to mitigate the "unsafe-eval" security warning in Electron. The policy restricts content sources to enhance application security.

2. Updated Documentation: Added a new section to README.md with clear instructions on how to run the application on Windows 11, improving the developer experience for Windows users.

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name: Pull Request
about: Propose a change to the codebase

Summary of Changes

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Related Issue

• Closes #XXX

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Contributor's Self-Review Checklist

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• I have read the CONTRIBUTING.md document.
• My code follows the project's coding style and architectural patterns as described in DESIGN_PATTERNS.md.
• I have added or updated relevant tests for my changes.
• I have updated the documentation to reflect my changes (if applicable).
• My changes have been tested locally and are working as expected.

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