Add JDBC Spring Boot sample

samples/httpsession-jdbc-boot/src/main/java/sample/config/HttpSessionConfig.java

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+/*
+ * Copyright 2014-2016 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.config;
+
+import org.springframework.session.jdbc.config.annotation.web.http.EnableJdbcHttpSession;
+
+// tag::class[]
+@EnableJdbcHttpSession // <1>
+public class HttpSessionConfig {
+}
+// end::class[]