Added installation instructions for Fedora

[PavelStishenko]

[qsuscs]

Thank you for your contribution. However, I have packaged the dependencies in my copr since a few months ago already, and as of yesterday, the editor itself as well. What do you think about including instructions on how to use those instead?

[textshell]

I have packaged the dependencies in my copr since a few months ago already, and as of yesterday, the editor itself as well. What do you think about including instructions on how to use those instead?

I think building from source is likely a use case too, but using the copr repo is a nice additional option that we could mention.