add travis

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>

.travis.yml

+# Copyright (c) 2020 Oracle and/or its affiliates. All rights reserved.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Eclipse Distribution License v. 1.0, which is available at
+# http://www.eclipse.org/org/documents/edl-v10.php.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+language: java
+
+dist: bionic
+
+jdk:
+  - oraclejdk11
+# jdk 14 does not provide JDK 8 compatible javadoc, disabled for now
+#  - oraclejdk14
+
+cache:
+  directories:
+    - .autoconf
+    - $HOME/.m2
+
+script:
+  - mvn -B -V -U -C -Poss-release clean verify org.glassfish.copyright:glassfish-copyright-maven-plugin:check -Dgpg.skip=true

README.md

-[//]: # " Copyright (c) 2018, 2019 Oracle and/or its affiliates. All rights reserved. "
+[//]: # " Copyright (c) 2018, 2020 Oracle and/or its affiliates. All rights reserved. "
 [//]: # "  "
 [//]: # " This program and the accompanying materials are made available under the "
 [//]: # " terms of the Eclipse Distribution License v. 1.0, which is available at "
@@ -6,6 +6,8 @@
 [//]: # "  "
 [//]: # " SPDX-License-Identifier: BSD-3-Clause "
 
+[![Build Status](https://travis-ci.com/eclipse-ee4j/jaxb-api.svg?branch=master)](https://travis-ci.com/eclipse-ee4j/jaxb-api)
+
 # Jakarta XML Binding project
 
 The Jakarta XML Binding provides an API and tools that automate the mapping