message: docs: add storybook local run instructions
diff: @@ -98,6 +98,17 @@ yarn build
  Each package defines its own build config, linting, and testing. You can have lerna run commands
  across all packages using the syntax `yarn run test` (or `yarn run test:watch` for watch mode) from the root `@superset-ui` directory.
  +#### Storybook
  +
  +You can demo your changes by running the storybook demo locally with the following commands:
  +
  +```sh
  +yarn install
  +yarn build
  +cd packages/superset-ui-plugins-demo
  +yarn storybook
  +```
  +
  ### Committing
  This repository follows [conventional commits](https://www.conventionalcommits.org/en/v1.0.0-beta.3/) guideline for commit messages and has a `commitlint` hook which will require you to have the valid commit message before committing. You can use `npm run commit` to help you create a commit message.
  