Add comparison with solid queue to readme

[sandstrom]

I really like Good Job! 🏅

But I think it would be helpful to newcomers to explain some of the main differences between Good Job and Solid Job, perhaps in a section in the readme.

https://github.com/basecamp/solid_queue

[bensheldon]

Thanks for the suggestion! Are you thinking it should be part of the table in the readme?

[sandstrom]

Don't know really, haven't thought about it. You'll probably make a more informed decision than me on that 😄