getting issue while trying to set up https://github.com/graphcool/graphql-playground/releases root@Jamsheer:/mnt/e/practice/graphql/playground/graphql-playground-master/graphql-playground-master# yarn start yarn start v0.15.1 error Command "start" not found. info Visit http://yarnpkg.com/en/docs/cli/start for documentation about this command. Any clue for this ?