docs: add RPM recommended resources

If a rpmlint rc file (`rpmlintrc`, `.rpmlintrc` or `.rpmlint`) is found at the root of your repository,

it will be automatically used by the template.

## Extra - Recommended resources

Here are some recommended resources about RPM packaging:

- [RPM official website](https://rpm.org/)

- [RPM Packaging Guide](https://rpm-packaging-guide.github.io/)

- [Fedora Packaging Guidelines](https://docs.fedoraproject.org/en-US/packaging-guidelines/)

   With many language-specific guides:

    - [Java](https://docs.fedoraproject.org/en-US/packaging-guidelines/Java/)

    - [Node.js](https://docs.fedoraproject.org/en-US/packaging-guidelines/Node.js/)

    - [Python](https://docs.fedoraproject.org/en-US/packaging-guidelines/Python/)

    - [Ruby](https://docs.fedoraproject.org/en-US/packaging-guidelines/Ruby/)

    - [Rust](https://docs.fedoraproject.org/en-US/packaging-guidelines/Rust/)

    - [Golang](https://docs.fedoraproject.org/en-US/packaging-guidelines/Golang/)

    - [PHP](https://docs.fedoraproject.org/en-US/packaging-guidelines/PHP/)

    - ...