Added Twitter Direct Message Source Kamelet

docs/modules/ROOT/pages/twitter-directmessage-source.adoc

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+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT
+= image:kamelets/twitter-directmessage-source.svg[] Twitter Direct Message Source
+
+*Provided by: "Apache Software Foundation"*
+
+Allows to get all direct messages for your Twitter account.
+
+It requires tokens that can be obtained by creating an application 
+in the Twitter developer portal: https://developer.twitter.com/.
+
+== Configuration Options
+
+The following table summarizes the configuration options available for the `twitter-directmessage-source` Kamelet:
+[width="100%",cols="2,^2,3,^2,^2,^3",options="header"]
+|===
+| Property| Name| Description| Type| Default| Example
+| *accessToken {empty}* *| Access Token| The Access Token from the Twitter application in the developer portal| string| | 
+| *accessTokenSecret {empty}* *| Access Token Secret| The Access Token Secret from the Twitter application in the developer portal| string| | 
+| *apiKey {empty}* *| API Key| The API Key from the Twitter application in the developer portal| string| | 
+| *apiKeySecret {empty}* *| API Key Secret| The API Key Secret from the Twitter application in the developer portal| string| | 
+| *user {empty}* *| User| The user we want to read the direct messages| string| | `"ApacheCamel"`
+|===
+
+NOTE: Fields marked with ({empty}*) are mandatory.
+
+== Usage
+
+This section summarizes how the `twitter-directmessage-source` can be used in various contexts.
+
+=== Knative Source
+
+The `twitter-directmessage-source` Kamelet can be used as Knative source by binding it to a Knative object.
+
+.twitter-directmessage-source-binding.yaml
+[source,yaml]
+----
+apiVersion: camel.apache.org/v1alpha1
+kind: KameletBinding
+metadata:
+  name: twitter-directmessage-source-binding
+spec:
+  source:
+    ref:
+      kind: Kamelet
+      apiVersion: camel.apache.org/v1alpha1
+      name: twitter-directmessage-source
+    properties:
+      accessToken: "The Access Token"
+      accessTokenSecret: "The Access Token Secret"
+      apiKey: "The API Key"
+      apiKeySecret: "The API Key Secret"
+      user: "ApacheCamel"
+  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 `twitter-directmessage-source-binding.yaml` file into your hard drive, then configure it according to your needs.
+
+You can run the source using the following command:
+
+[source,shell]
+----
+kubectl apply -f twitter-directmessage-source-binding.yaml
+----
+// THIS FILE IS AUTOMATICALLY GENERATED: DO NOT EDIT