Added release and snapshot URLs

Author: jyemin

README.md

@@ -3,6 +3,8 @@
  * driver home: http://github.com/mongodb/mongo-java-driver
  * mongodb home: http://www.mongodb.org/
  * javadoc: http://api.mongodb.org/java/
+ * releases: http://central.maven.org/maven2/org/mongodb/mongo-java-driver/
+ * snapshots: https://oss.sonatype.org/content/repositories/snapshots/org/mongodb/mongo-java-driver/
 
 ### Questions and Bug Reports
  * mailing list: http://groups.google.com/group/mongodb-user