docs: add testing and releasing contributor pages

docs/testing.md

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+# 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:
+
+```
+pip install yamllint 'molecule[docker]~=3.5.2' ansible-core flake8 ansible-lint voluptuous
+molecule test --all
+```
+
+
+## Integration testing
+
+Demo repositories which depend on the collection, and aggregate functionality with other middleware_automation collections, are automatically rebuilt
+at every collection release to ensure non-breaking changes and consistent behaviour.
+
+The repository are:
+
+ - [Flange demo](https://github.com/ansible-middleware/flange-demo)
+   A deployment of Wildfly cluster integrated with keycloak and infinispan.
+ - [CrossDC keycloak demo](https://github.com/ansible-middleware/cross-dc-rhsso-demo)
+   A clustered multi-regional installation of keycloak with infinispan remote caches.
+
+
+## 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
+pip install ansible-core
+# clone the repository
+git clone https://github.com/ansible-middleware/keycloak
+cd keycloak
+# install collection dependencies
+ansible-galaxy collection install -r requirements.yml
+# install collection python deps
+pip install -r requirements.txt
+# create inventory for localhost
+cat << EOF > inventory
+[keycloak]
+localhost ansible_connection=local
+EOF
+# run the playbook
+ansible-playbook -i inventory playbooks/keycloak.yml
+```
+