Add HTML Element example to readme for block-indentation.
Add HTML Element example to readme for block-indentation.

oriSomething/ember-cli-template-lint,oriSomething/ember-cli-template-lint,rwjblue/ember-cli-template-lint,rwjblue/ember-cli-template-lint,rwjblue/ember-template-lint,oriSomething/ember-template-lint