Install ruby gems:
bundle
Install JS packages:
yarn
rename application.yml.example to application.yml.
Run rake secret to generate a secret key. Paste this into your new application.yml
setup database:
bundle exec rake db:setup
start local server:
bundle exec rails server
Visit localhost:3000. Create a new user (email does not need to be real yet).
Client-side entry point is at app/assets/javascripts/application.js
Visit /graphiql in browser to play around with the graphql API.