Updated README.md with more information

Author: sindbach

README.md

@@ -14,11 +14,19 @@ Which would run the spark node and the mongodb node, and provides you with bash
 
 From the spark instance, you could reach the MongoDB instance using `mongodb` hostname. 
 
+You can find a small dataset example in `/home/ubuntu/times.json` which you could load into the mongodb instance.
+
+As an example, please take a look at `reduceByKey.scala` to query from mongodb, run a simple aggregation, and finally write out back to mongodb.
 
 
 ### More Information. 
 
 See related article:
 
-* [Using MongoDB with Hadoop and Spark: Part 1 - Introduction and Setup](https://www.mongodb.com/blog/post/using-mongodb-hadoop-spark-part-1-introduction-setup)
+* [MongoDB Hadoop use cases ](https://docs.mongodb.org/ecosystem/use-cases/hadoop/)
+
+* [MongoDB Blog: aggregating intervals of stock prices](https://www.mongodb.com/blog/post/using-mongodb-hadoop-spark-part-1-introduction-setup)
+
+* [MongoDB Radio: Hadoop connector with Luke Lovett](https://soundcloud.com/mongodb/hadoop-connector-with-luke-lovett)
 
+* [In development: MongoDB Spark Connector](https://github.com/mongodb/mongo-spark)