add simple java config

spring-data-mongodb/src/main/java/org/baeldung/config/SimpleMongoConfig.java

@@ -0,0 +1,25 @@
+package org.baeldung.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
+
+import com.mongodb.Mongo;
+import com.mongodb.MongoClient;
+
+@Configuration
+@EnableMongoRepositories(basePackages = "org.baeldung.repository")
+public class SimpleMongoConfig {
+
+    @Bean
+    public Mongo mongo() throws Exception {
+        return new MongoClient("localhost");
+    }
+
+    @Bean
+    public MongoTemplate mongoTemplate() throws Exception {
+        return new MongoTemplate(mongo(), "test");
+    }
+
+}