Update docs of External Task Listener Plugin

Author: falko

snippets/engine-plugin-external-task-listener/README.md

@@ -8,12 +8,12 @@ This project has been generated by the Maven archetype
 [camunda-archetype-engine-plugin-7.11.1](http://docs.camunda.org/latest/guides/user-guide/#process-applications-maven-project-templates-archetypes).
 
 ## Show me the important parts!
-![BPMN Process](src/main/resources/process.png)
+![BPMN Process](src/test/resources/process.png)
 
 ## How does it work?
 
 ## How to use it?
-To get started refer to `InMemoryH2Test` and `camunda.cfg.xml`.
+To get started refer to `ProcessUnitTest` and `camunda.cfg.xml`.
 For using it in production you have to [integrate the plugin into your Camunda BPM configuration](https://docs.camunda.org/manual/latest/user-guide/process-engine/process-engine-plugins/).
 
 ## Environment Restrictions

snippets/engine-plugin-external-task-listener/src/test/resources/process.bpmn

@@ -9,20 +9,27 @@
     </bpmn:endEvent>
     <bpmn:sequenceFlow id="SequenceFlow1" sourceRef="StartEventProcessStarted" targetRef="Task_DoSomething" />
     <bpmn:sequenceFlow id="SequenceFlow_14t5oxg" sourceRef="Task_DoSomething" targetRef="EndEventProcessEnded" />
-    <bpmn:serviceTask id="Task_DoSomething" name="Do something" camunda:type="external" camunda:topic="DoSomething">
+    <bpmn:serviceTask id="Task_DoSomething" name="External Task" camunda:type="external" camunda:topic="DoSomething">
       <bpmn:incoming>SequenceFlow1</bpmn:incoming>
       <bpmn:outgoing>SequenceFlow_14t5oxg</bpmn:outgoing>
     </bpmn:serviceTask>
+    <bpmn:textAnnotation id="TextAnnotation_0fuvoz5">
+      <bpmn:text>The External Task Listener registered in the Process Engine Plugin will be notified and completes the Task in a separate thread without locking it</bpmn:text>
+    </bpmn:textAnnotation>
+    <bpmn:association id="Association_0rpbqmm" sourceRef="Task_DoSomething" targetRef="TextAnnotation_0fuvoz5" />
   </bpmn:process>
   <bpmndi:BPMNDiagram id="BPMNDiagram_1">
     <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="engine-plugin-external-task-listener">
       <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEventProcessStarted">
         <dc:Bounds x="173" y="102" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="170" y="146" width="41" height="27" />
+        </bpmndi:BPMNLabel>
       </bpmndi:BPMNShape>
       <bpmndi:BPMNShape id="EndEvent_0fkea3f_di" bpmnElement="EndEventProcessEnded">
         <dc:Bounds x="428" y="102" width="36" height="36" />
         <bpmndi:BPMNLabel>
-          <dc:Bounds x="426" y="138" width="40" height="24" />
+          <dc:Bounds x="425" y="146" width="41" height="27" />
         </bpmndi:BPMNLabel>
       </bpmndi:BPMNShape>
       <bpmndi:BPMNEdge id="SequenceFlow_08va5r8_di" bpmnElement="SequenceFlow1">
@@ -42,6 +49,13 @@
       <bpmndi:BPMNShape id="ServiceTask_0q0edfm_di" bpmnElement="Task_DoSomething">
         <dc:Bounds x="269" y="80" width="100" height="80" />
       </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="TextAnnotation_0fuvoz5_di" bpmnElement="TextAnnotation_0fuvoz5">
+        <dc:Bounds x="280" y="200" width="210" height="70" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNEdge id="Association_0rpbqmm_di" bpmnElement="Association_0rpbqmm">
+        <di:waypoint x="342" y="160" />
+        <di:waypoint x="365" y="200" />
+      </bpmndi:BPMNEdge>
     </bpmndi:BPMNPlane>
   </bpmndi:BPMNDiagram>
 </bpmn:definitions>