Add compatibility matrix

modules/release-notes/ref-release-notes-compatibility-matrix.adoc

@@ -0,0 +1,41 @@
+:_content-type: REFERENCE
+[id="compatibility-matrix"]
+= Compatibility matrix
+
+The following table lists products and their versions compatible with {product-short} {product-version}:
+
+.Platform Compatibility Matrix
+[cols="1,2,1", options="header"]
+|===
+| {product-short} | Platform | {product-custom-resource-type} Version
+
+| `{product-version}`
+|
+- {ocp-brand-name} `{ocp-version-min}`-`{ocp-version}`
+
+- {eks-brand-name} ({eks-short})
+
+- {aks-brand-name} ({aks-short})
+
+- {aro-brand-name} ({aro-short})
+
+- {rosa-brand-name} ({rosa-short})
+
+- {gke-brand-name} ({gke-short})
+| `{product-backstage-version}`
+| `1.3`
+|
+- {ocp-brand-name} `4.14`-`4.16`
+
+- {eks-brand-name} ({eks-short})
+
+- {aks-brand-name} ({aks-short})
+
+- {aro-brand-name} ({aro-short})
+
+- {rosa-brand-name} ({rosa-short})
+
+- {gke-brand-name} ({gke-short})
+| `1.29`
+|===
+

titles/rel-notes-rhdh/title-rhdh-release-notes.adoc

@@ -8,6 +8,9 @@ include::artifacts/attributes.adoc[]
 
 {product} ({product-short}) {product-version} is now generally available. {product-short} is a fully supported, enterprise-grade productized version of upstream Backstage v{product-backstage-version}. You can access and download the {product} application from the {company-name} https://access.redhat.com/downloads[Customer Portal] or from the https://catalog.redhat.com/search?gs&q=rhdh&searchType=containers[Ecosystem Catalog].
 
+include::modules/release-notes/ref-release-notes-compatibility-matrix.adoc[leveloffset=+1]
+
+
 include::modules/release-notes/ref-release-notes-new-features.adoc[leveloffset=+1]