Planning considerations assembly added

Author: apinnick

_topic_map.yml

@@ -2062,6 +2062,8 @@ Topics:
   File: about-migrating-from-3-to-4
 - Name: Differences between OpenShift Container Platform 3 and 4
   File: planning-migration-3-4
+- Name: Planning considerations
+  File: planning-considerations-3-4
 - Name: About MTC
   File: about-mtc-3-4
 - Name: Installing MTC

migrating_from_ocp_3_to_4/planning-considerations-3-4.adoc

@@ -0,0 +1,12 @@
+[id="planning-considerations-3-4"]
+= Planning considerations
+include::modules/common-attributes.adoc[]
+:context: planning-considerations-3-4
+
+toc::[]
+
+This section describes considerations and strategies for planning your migration from {product-title} 3 to 4.
+
+// content:
+// https://bugzilla.redhat.com/show_bug.cgi?id=1968377
+// https://bugzilla.redhat.com/show_bug.cgi?id=1968352