Update readme for clarity.
Update readme for clarity.

Explicitly specify that the Ember CLI app must be manually created with Ember CLI. Those coming from Ember Rails might expect that to happen automatically as part of the gem.

jgadbois/ember-cli-rails,seanpdoyle/ember-cli-rails,johan--/ember-cli-rails,koryteg/glimmer-rails,seanpdoyle/ember-cli-rails,Szeliga/ember-cli-rails,weggesser/ember-cli-rails,koryteg/glimmer-rails,KeenRegard/ember-cli-rails,thoughtbot/ember-cli-rails,koryteg/glimmer-rails,seanpdoyle/ember-cli-rails,thoughtbot/ember-cli-rails,rwz/ember-cli-rails,harisadam/ember-cli-rails,rwz/ember-cli-rails,thoughtbot/ember-cli-rails,rwz/ember-cli-rails,weggesser/ember-cli-rails,weggesser/ember-cli-rails