Why should this be included in the repository?: It's a brightness control applet for the Budgie desktop.
Is it Open Source: Yes
How many users do you anticipate will use this software?: Many
Link to source tarball/zip file: https://github.com/ilgarmehmetali/budgie-brightness-control-applet/archive/v0.2.tar.gz
Again. Don't post package.yml files. We have a packaging process: https://solus-project.com/articles/packaging/guide/en/
You also shouldn't be claiming things that haven't been accepted.