Add prettier config file + recommended extension

Flojito Stillnetrequested to merge
flodef/ginkgo:master into master

WARNING: Really sorry, I tried everything I can but for some reasons, I cannot make a merge request with only the 2 files I commited !! I would be happy to learn how to do it properly ...

The only changes are the last 2 files .prettierrc and .vscode/extensions.json

Merge request reports