Update README.md

Author: Rafał Warzycha

README.md

@@ -1,6 +1,6 @@
 # mongo-cluster-docker
 
-Simple 3 node replica mongodb on offcial `mongo` docker image using `docker-compose`.
+This is a simple 3 node replica mongodb setup based on offcial `mongo` docker image using `docker-compose` described in my blogpost at https://warzycha.pl/mongo-db-sharding-docker-example/.
 
 # Run
 
@@ -77,4 +77,4 @@ Basically `mongosetup` service is now splitted to multiple `yml` files. :)
 
 See more @ `ENV.md`
 
-MIT @ `LICENSE`
+MIT @ `LICENSE`