Extract vars, template fixes, add README

molecule/default/converge.yml

@@ -5,4 +5,6 @@
   tasks:
     - name: Include keycloak role
       include_role:
-        name: ../../roles/keycloak
+        name: ../../roles/keycloak
+      vars:
+        keycloak_admin_password: "changeme"

molecule/default/verify.yml

@@ -4,7 +4,7 @@
   tasks:
     - name: Populate service facts
       ansible.builtin.service_facts:
-    - name: Check if infinispan service started
+    - name: Check if keycloak service started
       assert:
         that:
           - ansible_facts.services["keycloak.service"]["state"] == "running"