doc: add json transformation example

example/config-ping-json.yaml

@@ -0,0 +1,75 @@
+apiVersion: sources.knative.dev/v1
+kind: PingSource
+metadata:
+  name: ps-transformation-demo
+spec:
+  schedule: "*/1 * * * *"
+  contentType: "application/json"
+  data: '{
+    "salesorderNumber":"A000003769",
+    "soldToId":"0000469010",
+    "shipToId":"0000469010",
+    "endCustomerId":"0000469010",
+    "emailAddress":"no-reply@zeiss.com",
+    "salesOrganisation":"0305",
+    "senderBusinessSystemId":"Q8E_010_Q_ERP",
+    "positions":[
+      {
+        "position":"000070",
+        "materialNumber":"000000000001983899",
+        "quantity":1,
+        "durationInDays":0,
+        "ibaseSerialNumber":"",
+        "ibaseMaterialNumber":"",
+        "plant":"6101",
+        "selected":true
+      }
+    ]
+  }'
+  sink:
+    ref:
+      apiVersion: flow.typhoon.zeiss.com/v1alpha1
+      kind: Transformation
+      name: trn-transformation-demo
+
+---
+
+apiVersion: flow.typhoon.zeiss.com/v1alpha1
+kind: Transformation
+metadata:
+  name: trn-transformation-demo
+spec:
+  sink:
+    ref:
+      apiVersion: serving.knative.dev/v1
+      kind: Service
+      name: event-success-capture
+      namespace: default
+
+  context:
+  - operation: store
+    paths:
+    - key: $time
+      value: time
+    - key: $id
+      value: id
+  - operation: add
+    paths:
+    - key: id
+      value: $person-$id
+    - key: type
+      value: com.zeiss.typhoon.transformation.pingsource
+
+  data:
+  - operation: add
+    paths:
+    - key: event.ID
+      value: $id
+    - key: event.time
+      value: $time
+  - operation: shift
+    paths:
+    - key: senderBusinessSystemId:senderId
+  - operation: delete
+    paths:
+    - key: emailAddress