Logout - RP-Initiated - User Confirmation page (optional, not required by conformance tests)

_miltonbo commented on Feb 28, 2020_
### Issue
According to the documentation we SHOULD add a step in the logout endpoint when it is RP-Initiated. That step is to ask to the user whether he wants to log out.

**Documentation**
[https://openid.net/specs/openid-connect-session-1_0.html](url)

> At the logout endpoint, the OP SHOULD ask the End-User whether he wants to log out of the OP as well. If the End-User says "yes", then the OP MUST log out the End-User.

**SHOULD aclaration**
According to the [RFC documentation](https://www.rfc-editor.org/rfc/inline-errata/rfc2119.html) SHOULD word is the adjective "RECOMMENDED", means that there may exist valid reasons in particular circumstances to ignore a particular item, but the full implications must be understood and carefully weighed before choosing a different course.