Add user authentication endpoints

[crosescu]

We are currently building a React-powered web app using the REST API and I need to add user authentication.
I was looking through the wp-calypso code and I noticed that they are using the user authentication endpoints below which is exactly what I need for our project:

`
​https://wordpress.com/wp-login.php?action=login-endpoint
​https://wordpress.com/wp-login.php?action=social-login-endpoint
​https://wordpress.com/wp-login.php?action=logout-endpoint
`

The above endpoints are used in [wp-calypso](​https://github.com/Automattic/wp-calypso/blob/master/client/state/login/actions.js)

[pento]

Thank you for the feature request, @crosescu!

These endpoints are currently under development on WordPress.com, and will only be available for use by specific apps (hence client_id and client_secret being included in each request).

That said, these endpoints are different to what will likely end up in WordPress Core, as they contain a significant amount of WordPress.com specific code. There's been ​some discussion on what a Core solution would look like, the #core-passwords channel in ​WordPress Slack would be the best place to see where discussions are currently at.