FI-2469 README Updates (#62)

README.md

@@ -202,6 +202,72 @@ performs a token refresh.
 * `include_scopes`: (`true/false`) Whether to include scopes in the refresh
   request
 
+### Backend Services Authorization Group
+The [Backend Services Authorization Group](https://github.com/inferno-framework/smart-app-launch-test-kit/blob/main/lib/smart_app_launch/backend_services_authorization_group.rb)
+is only part of SMART App Launch STU 2.0. It is used when autonomous or
+semi-autonomous backend services (clients) need to access resources from FHIR
+servers that have pre-authorized, defined scopes of access.  This group appplies
+a client credentials flow using confidential client asymmetric
+authentication and JSON Web Token (JWT) assertions to retrieve an access token
+for system resources.
+
+**id:** `backend_services_authorization`
+
+**inputs:** `smart_token_url`, `backend_services_client_id`,
+`backend_services_requested_scope`, `client_auth_encryption_method`, `backend_services_jwks_kid` (optional)
+
+**outputs:**  `bearer_token`
+
+### Token Introspection Group 
+The [Token Introspection Group](https://github.com/inferno-framework/smart-app-launch-test-kit/blob/main/lib/smart_app_launch/token_introspection_group.rb)
+is only part of SMART App Launch STU 2.0 and is divided into three subgroups that
+can be run collectively or independently, depending on the constraints of the environment
+under test. 
+
+**id:** `smart_token_introspection`
+
+#### Token Introspection Access Token Group
+The [Token Introspection Access Token Group](https://github.com/inferno-framework/smart-app-launch-test-kit/blob/main/lib/smart_app_launch/token_introspection_access_token_group.rb) 
+reuses tests from the Discovery and Standalone Launch groups to retrieve the
+token endpoint and an access token for introspection.  This group is optional.   
+
+**id:** `smart_token_introspection_access_token_group`
+
+**inputs:** `url`, `client_id`, `client_secret`, `requested_scopes`, `use_pkce`,
+`pkce_code_challenge_method`, `authorization_method`, `client_auth_type`, `client_auth_encryption_method`
+
+**outputs:** `standalone_access_token`
+
+#### Token Introspection Request Group
+The [Token Introspection Request Group](https://github.com/inferno-framework/smart-app-launch-test-kit/blob/main/lib/smart_app_launch/token_introspection_request_group.rb) 
+sends introspection requests for both a valid and invalid access token to the
+authorization server and ensure the appropriate HTTP response is returned.  This
+group is optional but recommended. 
+
+**id:** `smart_token_introspection_request_group`
+
+**inputs:** `well_known_introspection_url`, `custom_authorization_header`,
+`optional_introspection_request_params`, `standalone_access_token` 
+
+**outputs:**
+* `active_token_introspection_response_body`
+* `invalid_token_introspection_response_body`
+
+#### Token Introspection Response Group
+The [Token Introspection Response Group](https://github.com/inferno-framework/smart-app-launch-test-kit/blob/main/lib/smart_app_launch/token_introspection_response_group.rb)
+validates the token introspection responses returned from the authorization
+server.  This group is required to demonstrate token introspection capabilities. 
+
+**id:** `smart_token_introspection_response_group`
+
+**inputs:** `standalone_client_id`, `standalone_received_scopes`,
+`standalone_id_token`, `standalone_patient_id`, `standalone_encounter_id`,
+`active_token_introspection_response_body`,
+`invalid_token_introspection_response_body`
+
+**outputs:** none
+
+
 ## License
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use