Added Json Serialize Action

docs/modules/ROOT/pages/json-serialize-action.adoc

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+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT
+= image:kamelets/json-serialize-action.svg[] Json Serialize Action
+
+*Provided by: "Apache Software Foundation"*
+
+Serialize payload to JSON
+
+== Configuration Options
+
+The Kamelet does not specify any configuration option.
+
+== Usage
+
+This section summarizes how the `json-serialize-action` can be used in various contexts.
+
+=== Knative Action
+
+The `json-serialize-action` Kamelet can be used as intermediate step in a binding.
+
+.json-serialize-action-binding.yaml
+[source,yaml]
+----
+apiVersion: camel.apache.org/v1alpha1
+kind: KameletBinding
+metadata:
+  name: json-serialize-action-binding
+spec:
+  source:
+    ref:
+      kind: Kamelet
+      apiVersion: camel.apache.org/v1alpha1
+      name: timer-source
+    properties:
+      message: "Hello"
+  steps:
+  - ref:
+      kind: Kamelet
+      apiVersion: camel.apache.org/v1alpha1
+      name: json-serialize-action
+  sink:
+    ref:
+      kind: InMemoryChannel
+      apiVersion: messaging.knative.dev/v1
+      name: mychannel
+
+----
+
+Make sure you have xref:latest@camel-k::installation/installation.adoc[Camel K installed] into the Kubernetes cluster you're connected to.
+
+Save the `json-serialize-action-binding.yaml` file into your hard drive, then configure it according to your needs.
+
+You can run the action using the following command:
+
+[source,shell]
+----
+kubectl apply -f json-serialize-action-binding.yaml
+----
+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT