Document debugging

[lukemelia]

Currently trying to figure out how to get a breakpoint in a codemod and wishing it were documented. 😄

[rwjblue]

I think the easiest thing to do would be to use ndb, which ensures any sub processes that are launched are also connected to the outer debugging session. It’s somewhat of a game changer...

[rajasegar]

@lukemelia @rwjblue Will this help
https://github.com/rajasegar/ember-angle-brackets-codemod#debugging-workflow
If yes, I can raise a PR to update the README

[rwjblue]

Yes, that looks like a great start! FWIW, I think you need to use --runInBand flag for the debugger statements to be hit when focusing the test with jest (I usually use something like node --inspect-brk ./node_modules/.bin/jest --testNamePattern "ember-concurrency transforms correctly" --runInBand).