Syntax highlighting for `*.repo` files

[ngarside]

Add RPM *.repo syntax highlighting to the ini (properties) extension.

# https://packages.microsoft.com/config/opensuse/15/prod.repo

[packages-microsoft-com-prod]
name=packages-microsoft-com-prod
baseurl=https://packages.microsoft.com/opensuse/15/prod/
enabled=1
gpgcheck=1
gpgkey=https://packages.microsoft.com/keys/microsoft.asc

• https://developers.redhat.com/articles/2022/10/07/whats-inside-rpm-repo-file

[aeschli]

You can always file extension associations in your user settings...

Feel free to make a PR.