OSSM-3796: Refactor adding services to a mesh

modules/ossm-about-namespace.adoc

@@ -0,0 +1,15 @@
+// Module included in the following assemblies:
+//
+// * service_mesh/v2x/installing-ossm.adoc
+
+:_content-type: CONCEPT
+[id="ossm-about-namespace_{context}"]
+= About namespace
+
+A Kubernetes namespace provides a mechanism to scope resources in a cluster. In OpenShift, a project is a Kubernetes namespace with additional annotations.
+
+There are two ways you can either add a namespace to a mesh or remove a namespace from a mesh.
+
+* You can manually specify each individual namespace in the `spec.members` field in the `ServiceMeshMemberRoll` resource.
+
+* You can create a `ServiceMeshMember` resource in a namespace.