Add JNDI Sample

Add a sample application that can be deployed to WildFly to demonstrate
how JTA can be used when running in a application server.

See gh-947

spring-boot-samples/spring-boot-sample-jta-jndi/src/main/java/sample/jndi/AccountRepository.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2012-2014 the original author or authors.
+ *
+ * Licensed 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.
+ */
+
+package sample.jndi;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface AccountRepository extends CrudRepository<Account, Long> {
+
+}