Adds custom rbac template to deploy directory #300

* Used for creating a new custom rbac ConfigMap

Author: phantomjinx

deploy/templates/README.md

@@ -0,0 +1,39 @@
+# Hawtio-Online Templates
+
+## Custom Hawtio custom-hawtio-online-rbac.yml
+
+A template for adding a ConfigMap for custom RBAC rules. To apply, users should execute the following command, setting the *APP_NAME* to an appropriate value for their configuration:
+```
+kubectl process -f custom-hawtio-online-rbac.yml -p APP_NAME=custom-hawtio | kubectl create -f -
+```
+
+Once applied, the ConfigMap can be edited using the command:
+```
+kubectl edit configmap <APP_NAME>-rbac  # change the APP_NAME to match the previous command
+```
+
+### Using the ConfigMap
+
+1. If using the [operator](https://github/hawtio/hawtio-operator), specify the ConfigMap name in the Hawtio CR:
+```yaml
+apiVersion: v1
+items:
+- apiVersion: hawt.io/v1
+  kind: Hawtio
+  metadata:
+    name: hawtio-online
+    namespace: hawtio-dev
+  spec:
+    rbac:
+      configMap: custom-hawtio-rbac
+...
+```
+1. If installing via the command line, using the `deploy` directory, edit the [base/deployment.yml](https://github.com/hawtio/hawtio-online/blob/main/deploy/base/deployment.yml) file and change the following:
+```yaml
+...
+volumes:
+  - name: hawtio-rbac
+    configMap:
+      name: <APP_NAME>-rbac
+...
+```