docs: add oidc guacamole integration (#3772)

docs/content/en/integration/openid-connect/apache-guacamole/index.md

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+---
+title: "Apache Guacamole"
+description: "Integrating Apache Guacamole with the Authelia OpenID Connect Provider."
+lead: ""
+date: 2022-07-13T03:42:47+10:00
+draft: false
+images: []
+menu:
+integration:
+parent: "openid-connect"
+weight: 620
+toc: true
+community: true
+---
+
+## Tested Versions
+
+* [Authelia]
+  * [v4.36.3](https://github.com/authelia/authelia/releases/tag/v4.36.2)
+* [Apache Guacamole]
+  * __UNKNOWN__
+
+## Before You Begin
+
+You are required to utilize a unique client id and a unique and random client secret for all [OpenID Connect] relying
+parties. You should not use the client secret in this example, you should randomly generate one yourself. You may also
+choose to utilize a different client id, it's completely up to you.
+
+This example makes the following assumptions:
+
+* __Application Root URL:__ `https://guacamole.example.com`
+* __Authelia Root URL:__ `https://auth.example.com`
+* __Client ID:__ `guacamole`
+* __Client Secret:__ `guacamole_client_secret`
+
+## Configuration
+
+### Application
+
+To configure [Apache Guacamole] to utilize Authelia as an [OpenID Connect] Provider use the following configuration:
+
+```yaml
+openid-client-id: guacamole
+openid-scope: openid profile groups email
+openid-issuer: https://auth.example.com
+openid-jwks-endpoint: https://auth.example.com/jwks.json
+openid-authorization-endpoint: https://auth.example.com/api/oidc/authorization?state=1234abcedfdhf
+openid-redirect-uri: https://guacamole.example.com
+openid-username-claim-type: preferred_username
+openid-groups-claim-type: groups
+```
+
+### Authelia
+
+The following YAML configuration is an example __Authelia__
+[client configuration](../../../configuration/identity-providers/open-id-connect.md#clients) for use with
+[Apache Guacamole] which will operate with the above example:
+
+```yaml
+- id: guacamole
+  secret: guacamole_client_secret
+  public: false
+  authorization_policy: two_factor
+  scopes:
+    - openid
+    - profile
+    - groups
+    - email
+  redirect_uris:
+    - https://guacamole.example.com
+  response_types:
+    - id_token
+  grant_types:
+    - implicit
+  userinfo_signing_algorithm: none
+```
+
+## See Also
+
+* [Apache Guacamole OpenID Connect Authentication Documentation](https://guacamole.apache.org/doc/gug/openid-auth.html)
+
+[Authelia]: https://www.authelia.com
+[Apache Guacamole]: https://guacamole.apache.org/
+[OpenID Connect]: ../../openid-connect/introduction.md
+
+
+
+