chore: add demo gif to readme (#39)

## Description

<!-- Provide a brief description of your changes -->

**Note:** PR titles should follow [Conventional
Commits](https://www.conventionalcommits.org/) format (e.g.,
`feat(devbox): add support for custom env vars` or `fix(snapshot):
resolve pagination issue`) as they are used for automatic release notes
generation.

## Type of Change

<!-- Mark the relevant option with an 'x' -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Performance improvement
- [ ] Test updates

## Related Issues

<!-- Link to related issues using #issue-number -->
Closes #

## Changes Made

<!-- Describe the changes in detail -->

## Testing

<!-- Describe how you tested your changes -->

- [ ] I have tested locally
- [ ] I have added/updated tests
- [ ] All existing tests pass

## Checklist

- [ ] My code follows the code style of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have updated the documentation accordingly
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published

## Screenshots (if applicable)

<!-- Add screenshots to help explain your changes -->

## Additional Notes

<!-- Any additional information that reviewers should know -->

Author: dines-rl

README.md

@@ -6,6 +6,10 @@
 
 A beautiful CLI for managing Runloop built with Ink and TypeScript. Use it as an **interactive command-line application** with rich UI components, or as a **traditional CLI** for scripting and automation.
 
+<p align="center">
+  <img src="https://raw.githubusercontent.com/runloopai/rl-cli/main/misc/demo.gif" alt="Runloop CLI Demo" width="800">
+</p>
+
 ## Quick Example
 
 ```bash