Add .flowconfig

[arnostpleskot]

After initialising project with flow, you have to call flow init to make flow checker working.

Solution could be to add some basic .flowconfig file or call flow init after npm install.

[prichodko]

Thanks for pointing this out. I am planning to call flow init after npm install - you can see my TODO: comment here 😆. The reason I haven't done it yet is because I have to add types for the Next.js - link.