Add idwcc pararaph

docs/GETTING_STARTED.md

@@ -39,6 +39,7 @@
   - [Add or update additional properties for users and clients](#add-or-update-additional-properties-for-users-and-clients)
   - [Non-password authentication](#non-password-authentication)
   - [Multiple password authentication](#multiple-password-authentication)
+  - [Test a client configuration with Idwcc](#test-a-client-configuration-with-idwcc)
 - [Troubleshooting](#troubleshooting)
   - [Impossible to log in as administrator - N-factor issue](#impossible-to-log-in-as-administrator---n-factor-issue)
   - [Impossible to log in as administrator - Password lost](#impossible-to-log-in-as-administrator---password-lost)
@@ -658,6 +659,14 @@ The use-case why this feature was added is when the user backend is LDAP and thi
 
 Be careful that every password will allow the same access level to your Glewlwyd service, so all of them must be strong enough to avoid being guessed.
 
+### Test a client configuration with Idwcc
+
+The tool [idwcc](https://github.com/babelouest/iddawc/tree/master/tools/idwcc) is available via the library [iddawc](https://github.com/babelouest/iddawc) to test a client configuration with Glewlwyd (or any other OAuth2/OIDC provider).
+
+You can build the tool yourself, install it via a [pre-compiled package](https://github.com/babelouest/iddawc/releases/latest), or use the [docker image](https://github.com/babelouest/iddawc/tree/master/tools/idwcc#docker-image) available.
+
+See the [idwcc readme](https://github.com/babelouest/iddawc/blob/master/tools/idwcc/README.md) for more details.
+
 ## Troubleshooting
 
 ### Impossible to log in as administrator - N-factor issue