Add docs for builder status conditions

Signed-off-by: Tom Kennedy <[email protected]>

docs/builders.md

@@ -161,3 +161,13 @@ version) in the following order:
    `paketo-buildpacks/gradle` is a sub-buildpack of `paketo-buildpacks/java`)
 1. As a sub-buildpack of any ClusterBuildpacks
 1. As a sub-buildpack in the ClusterStore specified in the Builder spec.
+
+### <a id='status'></a>Builder Status Conditions
+
+Builders and ClusterBuilders have two Conditions that represent the overall status of the Builder.
+
+The 'Ready' condition is used to show that the Builder is able to be used in Builds
+
+The 'UpToDate' condition indicates whether the most recent reconcile of the Builder 
+was successful. When this condition is false, that means that the Builder may not have the 
+latest Stack or Buildpacks due to ongoing reconcile failures.