Vendor middleware_automation.keycloak collection

Needed for keycloak_authentication_v2, to manage Keycloak
authentication flows (e.g. the CCCHH browser flow) as YAML.
Chosen over community.general's own copy of the module (deprecated in
favor of this collection, and limited to 4 sub-flow levels there vs.
10 here).

ansible_collections/middleware_automation/keycloak/docs/testing.md

@@ -0,0 +1,23 @@
+# Testing
+
+## Continuous integration
+
+The collection is tested with a [molecule](https://github.com/ansible-community/molecule) setup covering the included roles and verifying correct installation and idempotency.
+In order to run the molecule tests locally with python 3.9 available, after cloning the repository:
+The test scenarios are available on the source code repository each on his own subdirectory under [molecule/](https://github.com/ansible-middleware/keycloak/molecule).
+
+
+## Test playbooks
+
+Sample playbooks are provided in the `playbooks/` directory; to run the playbooks locally (requires a rhel system with python 3.9+, ansible, and systemd) the steps are as follows:
+
+```
+# setup environment as in developing
+# create inventory for localhost
+cat << EOF > inventory
+[keycloak]
+localhost ansible_connection=local
+EOF
+# run the playbook
+ansible-playbook -i inventory playbooks/keycloak.yml
+```