[FEATURE]: Welcome Bot (Community Engagement)

### Feature and its Use Cases

**`CONTRIBUTING.md` emphasizes community and Discord participation. A Welcome Bot gives an immediate, friendly automated response to first-time contributors, guiding them to the Discord link or CONTRIBUTING.md file instantly.**

@Zahnentferner what do you think about this
, feel free to assign

### Additional Context

_No response_

### Code of Conduct

- [x] I have joined the [Discord server](https://discord.gg/hjUhu33uAn) and will post updates there
- [x] I have searched existing issues to avoid duplicates