src: add missing route configuration yaml

Author: lance

03-configs-and-routes/route/route_all_rev1.yaml

@@ -0,0 +1,8 @@
+apiVersion: serving.knative.dev/v1alpha1
+kind: Route
+metadata:
+  name: greeter
+spec:
+  traffic:
+    - revisionName: $revision
+      percent: 100