Added Exec Sink Kamelet

docs/modules/ROOT/pages/exec-sink.adoc

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+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT
+= image:kamelets/exec-sink.svg[] Exec Sink
+
+*Provided by: "Apache Software Foundation"*
+
+Execute system commands
+
+== Configuration Options
+
+The following table summarizes the configuration options available for the `exec-sink` Kamelet:
+[width="100%",cols="2,^2,3,^2,^2,^3",options="header"]
+|===
+| Property| Name| Description| Type| Default| Example
+| *args {empty}* *| The arguments| Arguments to pass to the executables| string| | 
+| *executable {empty}* *| Executable command| The command to execute| string| | 
+|===
+
+NOTE: Fields marked with ({empty}*) are mandatory.
+
+== Usage
+
+This section summarizes how the `exec-sink` can be used in various contexts.
+
+=== Knative Sink
+
+The `exec-sink` Kamelet can be used as Knative sink by binding it to a Knative object.
+
+.exec-sink-binding.yaml
+[source,yaml]
+----
+apiVersion: camel.apache.org/v1alpha1
+kind: KameletBinding
+metadata:
+  name: exec-sink-binding
+spec:
+  source:
+    ref:
+      kind: InMemoryChannel
+      apiVersion: messaging.knative.dev/v1
+      name: mychannel
+  sink:
+    ref:
+      kind: Kamelet
+      apiVersion: camel.apache.org/v1alpha1
+      name: exec-sink
+    properties:
+      args: "The The arguments"
+      executable: "The Executable command"
+
+----
+
+Make sure you have xref:latest@camel-k::installation/installation.adoc[Camel K installed] into the Kubernetes cluster you're connected to.
+
+Save the `exec-sink-binding.yaml` file into your hard drive, then configure it according to your needs.
+
+You can run the sink using the following command:
+
+[source,shell]
+----
+kubectl apply -f exec-sink-binding.yaml
+----
+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT