message: Update README for workflow package
diff: # @cardstack/workflow
  -This README outlines the details of collaborating on this Ember addon.
  +The workflow package gives host apps a workflow system where each workflow can
  +have a priority (which might change over time) and several tags.
  +
  +It displays a notification counter and, when opened, a couple of panels to see
  +the workflows grouped by priority and by tag. It allows to see at a glance
  +which workflows need to be acted on, and then act on them.
  +
  +## Public API
  +
  +Host apps need to render the `{{cardstack-workflow}}` component where they want
  +the workflow panels to appear (preferably in the left edge of the screen).
  +
  +The component accesses data through the `cardstack-workflow` service which also
  +defines the following methods for the host app to use:
  +
  +* `createThread(message1, message2, ...)`
  +* `createMessageFor(cardModel, properties)`
  +
  +Creating a message for each card model in your application is required (the
  +workflows work with messages under the hood) and is supported by the
  +`createMessageFor` method above.
  +
  +(We'll probably need a 3rd method to get the thread for a given card model).
  +
  +Let's see an example.
  +
  +Assume you have a rental model in your application and the corresponding card
  +model, `rental-card`. To create a workflow where a new rental is offered, you'd
  +do as follows:
  +
  +```js
  +
  +workflow: inject('cardstack-workflow'),
  +
  +let urgent = this.get('store').queryRecord('priority', { name: 'urgent' });
  +let bayArea = this.get('store').queryRecord('tag', { name: 'Bay Area' });
  +
  +let rentalCard = this.get('store').createRecord('rental-card');
  +
  +rentalCard.save(() => {
  + let message = this.get('workflow').createMessageFor(rentalCard, {
  + priority: urgent,
  + tags: [ bayArea ],
  + });
  + return this.get('workflow').createThread(message);
  +});
  +```
  +
  +In your app you define your models and then use the above methods to create a
  +workflow around them.
  +
  +For a detailed example, see the dummy app in this package.
  ## Installation
  * `git clone <repository-url>` this repository
  * `cd @cardstack/workflow`
  -* `npm install`
  +* `yarn install`
  ## Running
  -* `ember serve`
  +* `DEBUG=cardstack/* DEBUG_LEVEL=info ember s
  * Visit your app at [http://localhost:4200](http://localhost:4200).
  ## Running Tests
  -* `npm test` (Runs `ember try:each` to test your addon against multiple Ember versions)
  -* `ember test`
  +Run tests locally:
  +
  * `ember test --server`
  +TravisCI runs the tests for each ember version listed in `.travis.yml`.
  +
  ## Building
  * `ember build`
  