Show users which account they're signed into

**Issue by [rachelsquirrel](https://github.com/rachelsquirrel)**
_Tuesday Feb 09, 2016 at 11:09 GMT_

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It would be great to list the email address of the account users are signed into somewhere maybe under Simplenote > Account? Users often start using the app and then never sign out for a couple of years. Then they get a new computer or device and can't remember what email address they used when they first signed up and there's no way to check in the app.

Start by locating the macOS account settings UI, especially the Simplenote > Account area, and trace how the currently signed-in account is represented. Done means the signed-in email address is visible in the app so users can identify the account without signing out.

Written by the indexing model from the issue text.