message: docs: Updates doc with how to run tests
  Updates README with how to run tests, and the potential need to bootstrap web-scripts.
diff: @@ -77,6 +77,14 @@ the result of consensus between many web engineers inside Spotify, and the defau
  written by Spotify employees. _We may reject PRs to the ESLint config if we don't agree that the rule
  makes sense as part of our baseline, for example._ Use it if it aligns with your needs!
  +## Running Tests locally
  +
  +If you get an error like `Cannot find module '../cjs'` when running `yarn test`, you need to bootstrap web-scripts.
  +
  +```bash
  +$ yarn lerna run bootstrap
  +```
  +
  [eslint]: https://eslint.org/
  [typescript]: https://www.typescriptlang.org/
  [prettier]: https://prettier.io/
  