Create spring-hadoop-admin repository and template project

Create a repository 'spring-hadoop-admin' that uses the build structure of https://github.com/SpringSource/spring-data-rest-webmvc with the web resources/app of https://github.com/SpringSource/spring-batch-admin/tree/master/spring-batch-admin-sample

end goal is to deploy the admin application with an embedded container via
gradlew jettyRunWar