RHDEVDOCS-6339: Content creation for CMP

Incorporating SME review feedback

Author: Dhruv-Soni11

argocd_instance/argo-cd-cr-component-properties.adoc

@@ -17,6 +17,9 @@ include::modules/gitops-repo-server-properties.adoc[leveloffset=+1]
 // Enabling notifications with an Argo CD instance
 include::modules/gitops-argo-cd-notification.adoc[leveloffset=+1]
 
+// Enabling Config Management plugins in an Argo CD CR
+include::modules/con-enabling-config-management-plugins-argo-cd-cr.adoc[leveloffset=+1]
+
 // NotificationsConfiguration custom resource properties
 include::modules/con_notifications-configuration.adoc[leveloffset=+1]
 
@@ -31,3 +34,5 @@ include::modules/proc_configuring-notificationsconfiguration-crd-by-using-the-oc
 == Additional resources
 * xref:../argocd_instance/setting-up-argocd-instance.adoc#gitops-argo-cd-installation_setting-up-argocd-instance[Installing a user-defined Argo CD instance]
 
+* link:https://argo-cd.readthedocs.io/en/stable/operator-manual/config-management-plugins/#config-management-plugins[Config Management Plugins]
+

modules/con-enabling-config-management-plugins-argo-cd-cr.adoc

@@ -0,0 +1,46 @@
+// Module included in the following assemblies:
+//
+// * argocd_instance/argo-cd-cr-component-properties.adoc
+
+:_mod-docs-content-type: CONCEPT
+[id="enabling-config-management-plugins-argocd_{context}"]
+= Enabling Config Management Plugins in an Argo CD CR
+
+Argo CD provides support for Helm, Jsonnet, and Kustomize as built-in config management tools. To use a different config management tool, or to enable features not provided by the built-in config management tools, you can use the Config Management Plugin (CMP).
+
+In Argo CD, the CMP is specified as a sidecar container for the Argo CD repo server container. For more information, see "Config Management Plugins".
+
+In the {gitops-title} Operator, you can configure the Config Management plugin as a sidecar container in the Argo CD custom resource (CR). When you configure the sidecar container, you either specify an off-the-shelf or a custom-built container image. If you do not specify an image, the system uses the same image as the repo server for the plugin.
+
+To configure a sidecar container in the {gitops-title} Operator, add the `.spec.repo.sidecarContainers` key in the Argo CD CR. 
+
+.Example Config Management Plugin configuration
+[source,yaml]
+----
+apiVersion: argoproj.io/v1alpha1
+kind: ArgoCD
+metadata:
+ name: <my_argocd> # <1>
+spec:
+ repo:
+   sidecarContainers:
+     - name: <my_cmp> # <2>
+       command: [/var/run/argocd/argocd-cmp-server]
+       image: <my_image>
+       securityContext:
+         runAsNonRoot: <true>
+         runAsUser: <999>
+       volumeMounts: # <3>
+         - mountPath: /var/run/argocd
+           name: <var_files>
+         - mountPath: /home/argocd/cmp-server/plugins
+           name: plugins
+         - mountPath: /tmp
+           name: tmp
+         - mountPath: /home/argocd/cmp-server/config/plugin.yaml
+           subPath: <plugin.yaml>
+           name: <cmp_plugin>
+----
+<1> Specifies the name of an Argo CD CR instance.
+<2> Specifies the name of a sidecar container used in the repo server.
+<3> Specifies the name of volume mounts used in the repo server.