I think this is a commendable idea. It may be that conflating it with README is not the right idea, but I can definitely see value in having a playground/ sandb

I think this is a commendable idea. It may be that conflating it with README is not the right idea, but I can definitely see value in having a playground/ sandbox. Most people commenting here are probably comfortable in code and getting things up and running locally, but that isn’t everyone or even most people. Being able to see the library do what you want gives newer users far more incentive to stick with the possibly painful process of making it work for them in development.