Add rpm spec file

[knopki]

Hello, I did simple spec file for rpm packaging. I can build rpm package with just rpmbuild -ba .rpm/habitctl.spec. Also, I successfully built packages in Fedora's COPR. Other rpm-based distros can reuse that spec file.

[blinry]

Hey, this is awesome, thanks a lot! I'm always excited about proper packaging! If you'd like to try to make it an official Fedora package sometime, I'd cheer you on, and I'm sure a lot of people would be super grateful!

I wonder: Is it usual to have the spec file directly in the upstream project? Or should it rather live in the packaging infrastructure, where it can be changed more easily and directly?

[knopki]

If you'd like to try to make it an official Fedora package sometime, I'd cheer you on, and I'm sure a lot of people would be super grateful!

Sorry, I'm not a Fedora maintainer and I don't know how to propose package to official repositories. Real Fedora maintainer needed :)

I wonder: Is it usual to have the spec file directly in the upstream project? Or should it rather live in the packaging infrastructure, where it can be changed more easily and directly?

It's more usual to have the spec file in distro's repository, but sometime I saw specs in upstream repository. May be its better to leave spec file in wiki/docs as reference for other packagers.