docs: update README

[kagol]

PR

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Documentation
  • Updated feature list to highlight Spring Boot support as a backend option alongside NestJS.
  • Added a new link to the demonstration site.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The README.md file was updated to document Spring Boot as a supported backend framework alongside NestJS and to add a link for the demonstration site.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Updated feature list to include Spring Boot alongside NestJS as a backend support option; added new demonstration site link

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Spring Boot joins the garden, so neat,
NestJS now has a friend to meet,
A demo link shines bright and clear,
The README's freshened, cheers!

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch kagol/update-readme-add-pages

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 988a153 and bf2e4e0.

📒 Files selected for processing (1)

• README.md

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