added trait example of services

examples/traits/service/README.md

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+# SERVICE EXAMPLE
+
+This folder contains examples of how to use a `trait service`. You can use them to learn more about how to enable services for integrations deployed on the cluster.
+
+To access integration outside the cluster you can enable a nodePort when you deploy integration. An example is `./RestDSL.java.`
+
+You can also optionally decide to just go with the default clusterIP if you do not want your integration to be directly exposed to the outside world. An example of this use case is `./RestDSL2.java`

examples/traits/service/RestDSL.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// To run this integrations use:
+//     kamel run RestDSL.java --trait service.enabled=true\
+//     --trait service.node-port=true
+//
+import org.apache.camel.Exchange;
+
+public class RestDSL extends org.apache.camel.builder.RouteBuilder {
+    @Override
+    public void configure() throws Exception {
+        rest()
+            .get("/hello")
+            .to("direct:hello");
+
+        from("direct:hello")
+            .setHeader(Exchange.CONTENT_TYPE, constant("text/plain"))
+            .transform().simple("Hello World");
+    }
+}

examples/traits/service/RestDSL2.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// To run this integrations use:
+//     kamel run RestDSL2.java --trait service.enabled=true
+//
+import org.apache.camel.Exchange;
+
+public class RestDSL2 extends org.apache.camel.builder.RouteBuilder {
+    @Override
+    public void configure() throws Exception {
+        rest()
+            .get("/hello")
+            .to("direct:hello");
+
+        from("direct:hello")
+            .setHeader(Exchange.CONTENT_TYPE, constant("text/plain"))
+            .transform().simple("Hello World");
+    }
+}