API Server development

[sebastibe]

Hi! Thanks for the great template, it has been very helpful!

Playing around with the demo I was wondering how you were developing the API during development? Are you starting / restarting the local sever from the REPL when changing the API or you run it from lein directly?

I was thinking it could be great to add a bit of guidance about it in the README but I am not sure yet what is the best way to approach it to make a PR.