Add project structure section to README

[aayush-0131]

Added project structure section to README.md for better clarity on the project's organization and components.

📦 Pull Request: Civix Contribution

✅ Description

This pull requests add a project structure section to README file and also adds the missing backquotes in the README file

Fixes: #[issue-number]

📂 Type of Change

• Bug Fix 🐛
• New Feature ✨
• Documentation 📚
• UI/UX Enhancement 🎨
• Refactor 🧹
• [ ✅] Other:Documentation

📋 Checklist

• [✅ ] My code follows the contribution guidelines of Civix
• [ ✅] I have tested my changes locally
• [ ✅] I have updated relevant documentation
• [ ✅] I have linked related issues (if any)
• [ ]✅ This pull request is ready to be reviewed

🎥 Screenshots or Demo (if applicable)

Include screenshots or screen recordings of your change.

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[github-actions]

Thanks for creating a PR for your Issue! ☺️

We'll review it as soon as possible.
In the meantime, please double-check the file changes and ensure that all commits are accurate.

If there are any unresolved review comments, feel free to resolve them. 🙌🏼