Add sample upstream provider

README.md

@@ -67,7 +67,7 @@ You can add as much upstream provider as you want, using the following syntax in
 ```yaml
 - id: gitlab
   name: GitLab
-  logo: gitlab # Can be either gitea, gitlab, github, microsoft, google or a full URL
+  logo: gitlab # Can be either openid, gitea, gitlab, github, microsoft, google or a full URL
   client_id: CLIENT_ID_GIVEN_BY_PROVIDER
   client_secret: CLIENT_SECRET_GIVEN_BY_PROVIDER
   configuration_url: https://gitlab.com/.well-known/openid-configuration
@@ -108,5 +108,20 @@ Corresponding client configuration:
 
 OAuth proxy can then be access on this URL: http://192.168.2.103:4180/
 
+## Testing with upstream identity provider
+The folder [sample_upstream_provider](sample_upstream_provider) contains a working scenario of authentication with an upstream provider.
+
+Run the following command to run the scenario:
+
+```bash
+cd sample_upstream_provider
+docker compose up
+```
+
+- Upstream provider (not to be directly used): http://localhost:9001
+- BasicOIDC: http://localhost:8000
+- Client 2: http://localhost:8012
+- Client 1: http://localhost:8011
+
 ## Contributing
 If you wish to contribute to this software, feel free to send an email to contact@communiquons.org to get an account on my system, managed by BasicOIDC :)