message: add some initial models to dev mode
diff: /* eslint-env node */
  +const JSONAPIFactory = require('@cardstack/test-support/jsonapi-factory');
  +
  +function initialModels() {
  + let initial = new JSONAPIFactory();
  +
  + initial.addResource('content-types', 'posts')
  + .withRelated('fields', [
  + initial.addResource('fields', 'title').withAttributes({
  + fieldType: '@cardstack/core-types::string'
  + })
  + ]);
  + initial.addResource('posts', '1')
  + .withAttributes({
  + title: 'hello world'
  + });
  + initial.addResource('posts', '2')
  + .withAttributes({
  + title: 'second'
  + });
  + return initial.getModels();
  +}
  module.exports = [
  {
  @@ -12,7 +33,10 @@ module.exports = [
  type: 'data-sources',
  id: 'default',
  attributes: {
  - 'source-type': '@cardstack/ephemeral'
  + 'source-type': '@cardstack/ephemeral',
  + params: {
  + initialModels: initialModels()
  + }
  }
  },
  {
  