Add archival / deprecation notice to README.

Author: dmitrizagidulin

README.md

@@ -1,53 +1,12 @@
 # OpenID Connect for Nodejs
 
-[![Build Status](https://travis-ci.org/solid/oidc-op.svg?branch=master)](https://travis-ci.org/solid/oidc-op)
-[![codecov](https://codecov.io/gh/solid/oidc-op/branch/master/graph/badge.svg)](https://codecov.io/gh/solid/oidc-op)
+## Deprecation Notice
 
+This repository has been archived, and will no longer be maintained by the
+Solid Project.
 
-This library aims to implement a full-featured OpenID Connect Provider for
-Nodejs. It is not intended to be used directly by most developers, but rather
-via a complete self-contained server such as Anvil Connect. Some applications
-require an embedded identity provider, such as entertainment or IoT appliances.
-This package can be used directly in these cases.
-
-The module should make available an OIDCProvider class which can be
-instantiated multiple times to support multitenancy use cases. It should also
-have a method that provides a mountable router or app for widely used frameworks
-like Express.
-
-## Scope
-
-- Core
-- Discovery
-- Dynamic Registration
-- OAuth 2.0 Multiple Response Types
-- OAuth 2.0 Form Post Response Types
-- Session Management
-- Front-Channel Logout
-- Back-Channel Logout
-- OAuth 2.0 Client Credentials Grant
-- Proof Key for Code Exchange by OAuth Clients (PKCE)
-
-## Out of Scope
-
-- Local Authentication
-- Persistence
-
-## Internal Interface
-
-OpenID Connect makes no provisions for how a user is initially authenticated
-by the IdP. It's up to the implementer to determine whether to use passwords,
-LDAP, SAML, OAuth, or some other means. The host system is responsible for
-other dependencies of the OIDC authentication flows as well, such as
-persistence, managing user attributes, multi-factor auth and so on.
-
-In addition to implementing OpenID Connect Provider functions, this library
-defines an interface between OpenID Connect and the host application.
-
-The goal of the interface is to manage the flow of responsibility between the
-OpenID Connect implementation and functions provided by the host application,
-such as local user authentication, persistence, and domain specific event
-handing.
+Active maintenance has been moved to
+**[interop-alliance/oidc-op](https://github.com/interop-alliance/oidc-op)**.
 
 ## MIT License