feat(directives): add explanations on bootstraping
feat(directives): add explanations on bootstraping

cironunes/angular-testing-recipes,cironunes/angular-testing-recipes,willmendesneto/angular-testing-recipes,willmendesneto/angular-testing-recipes,andreybleme/angular-testing-recipes,andreybleme/angular-testing-recipes,rmdias/angular-testing-recipes,rmdias/angular-testing-recipes