Add archival / deprecation notice to README.

Author: dmitrizagidulin

README.md

@@ -6,113 +6,11 @@
 
 > OpenID Connect Relying Party for Node.js and the browser.
 
-- [x] Dynamic Configuration and Client Registration
-- [x] Authorization Code, Implicit, and Hybrid grants
-- [x] Relying Party initiated logout
-- [ ] Refresh grant
-- [ ] Client Credentials grant
-- [ ] Key rotation using JWK `kid` value
-- [ ] Session management
-- [ ] front- and back-channel logout
-- [X] Request parameters as JWT
-- [ ] Claims request parameter
-- [ ] Claims language tags
-- [ ] OAuth 2.0 Bearer Token requests
+## Deprecation Notice
 
-## Table of Contents
+This repository has been archived, and will no longer be maintained by the Solid Project.
 
-* [Security](#security)
-* [Background](#background)
-* [Install](#install)
-* [Usage](#usage)
-  * [Node.js](#nodejs)
-  * [Browser](#browser)
-* [Develop](#develop)
-* [Maintainers](#maintainers)
-* [Contribute](#contribute)
-* [MIT License](#mit-license)
-
-## Security
-
-...
-
-## Background
-
-...
-
-## Install
-
-```bash
-$ npm install @solid/oidc-rp --save
-```
-
-## Usage
-
-### Node.js
-
-```
-const RelyingParty = require('@solid/oidc-rp')
-```
-
-### Browser
-
-When loaded into an HTML page via `<script src="./dist/oidc.rp.min.js"></script>`,
-the library is exposed as a global var, `OIDC`.
-
-
-## Develop
-
-### Install
-
-```bash
-$ git clone git@github.com:solid/oidc-rp.git
-$ cd oidc-rp
-$ npm install
-```
-
-### Build
-
-**Important:**
-If you're using this library as a dependency and you plan to use Webpack, don't
-forget to add the following lines to your `webpack.config.js` `externals:` 
-section:
-
-```js
-  externals: {
-    'node-fetch': 'fetch',
-    '@sinonjs/text-encoding': 'TextEncoder',
-    'whatwg-url': 'window',
-    'isomorphic-webcrypto': 'crypto'
-  }
-```
-
-To build a Webpack-generated bundle:
-
-```bash
-npm run dist
-```
-
-### Test
-
-```bash
-npm test
-```
-
-## Maintainers
-
-* Dmitri Zagidulin
-
-## Contribute
-
-#### Style guide
-
-* ES6
-* Standard JavaScript
-* jsdocs
-
-### Code of conduct
-
-* @solid/oidc-rp follows the [Contributor Covenant](http://contributor-covenant.org/version/1/3/0/) Code of Conduct.
+Active maintenance has been moved to **[interop-alliance/oidc-rp](https://github.com/interop-alliance/oidc-rp)**.
 
 ### Contributors