Add ember-page-title to app default blueprint

text/0000-add-ember-page-title-addon.md

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+- Start Date: 2020-06-24
+- Relevant Team(s): Ember CLI
+- RFC PR: (after opening the RFC PR, update this with a link to it and update the file name)
+- Tracking: (leave this empty)
+- Authors: Benjamin Jegard, Melanie Sumner, Ricardo Mendes
+
+# Add ember-page-title to the app blueprint
+
+## Summary
+
+Add [`ember-page-title`](https://github.com/adopted-ember-addons/ember-page-title) to the default blueprint for new Ember apps as a way to provide improved out-of-the-box (OOB) accessibility for Ember applications.
+
+## Motivation
+
+This RFC is part of the work made by the Ember.js Accessibility Strike Team to ensure that newly created ember apps have no accessibility issues.
+
+Users with assistive technology rely on the page title to know if they are on the correct page of a website.
+Adding this addon will provide developers a simple solution to achieve the [WCAG Success Criterion 2.4.2: Page Titled](https://www.w3.org/WAI/WCAG21/Understanding/page-titled.html).
+
+While there're other addons that provide the same capabilities it has been decided to go with [`ember-page-title`](https://github.com/adopted-ember-addons/ember-page-title) because it's the most aligned with the current and future direction taken Ember, which is the template-based solution.
+
+## Detailed design
+
+1. Make [`ember-page-title`](https://github.com/adopted-ember-addons/ember-page-title) an official Ember addon by transferring `ember-page-title` repo to the [Ember CLI org](https://github.com/ember-cli) (it's currently in the [Adopted Ember Addons org](https://github.com/adopted-ember-addons))
+2. Add the dependency to the app blueprint here: https://github.com/ember-cli/ember-cli/blob/master/blueprints/app/files/package.json#L19
+4. Update route blueprint to include `{{page-title RouteName}}` at the top of the route [template.hbs](https://github.com/emberjs/ember.js/blob/master/blueprints/route/native-files/__root__/__templatepath__/__templatename__.hbs) (this [template.hbs](https://github.com/emberjs/ember.js/blob/master/blueprints/route/files/__root__/__templatepath__/__templatename__.hbs) too) where `RouteName` is the name of the route provided to the `ember generate route` command
+
+## How we teach this
+
+- Update the "Page Title" section in [Page Template Considerations](https://guides.emberjs.com/release/accessibility/page-template-considerations) to use `ember-page-title`.
+- Update code examples in [Building Pages](https://guides.emberjs.com/release/tutorial/part-1/building-pages/) to include uses of `{{page-title}}`. Also explain that updating the page title with the current page name will help users with assistive technology locate themself on the website.
+- Update [ember-welcome-page](https://github.com/ember-cli/ember-welcome-page) addon and [WelcomePage](https://github.com/ember-cli/ember-welcome-page/blob/master/addon/templates/components/welcome-page.hbs) component to explain the contents of the fresh project a bit better. The component should explain the presence of `{{page-title}}` and link to the "Page Title" section in [Page Template Considerations](https://guides.emberjs.com/release/accessibility/page-template-considerations)
+
+## Drawbacks
+
+- An additional dependency to new projects. But, no noticeable size differences it's only all +10kb of js for production builds (not gzipped, ~2kb js gzipped)
+- Add an extra helper `{{page-tile}}` (possible name clashing)
+- Slightly increases the learning curve. Increases the amount of code in a first-starter project, which could become overwhelming.
+- The addon will have to be maintained by the [Ember CLI org](https://github.com/ember-cli)
+
+## Alternatives
+
+N/A
+
+## Unresolved questions
+
+None
+
+## References
+
+- [WCAG Success Criterion 2.4.2: Page Titled](https://www.w3.org/WAI/WCAG21/Understanding/page-titled.html)