Update README.md

Author: fixone

README.md

@@ -9,8 +9,9 @@ wget -qO- https://raw.githubusercontent.com/academyofdata/clusterdock/master/clu
 
 once the docker cluster is running (there should be two nodes started with the default startup options) issue the following command to download all the files required and put them onto HDFS
 
+```
 sudo docker exec -ti \`sudo docker ps | grep clusterdock | grep secondary | head -1 | awk '{print $1}'\` bash -c "wget -qO- https://raw.githubusercontent.com/academyofdata/clusterdock/master/get2hdfs.sh | bash -s"
-
+```
 
 Otherwise, one can log in to one of the containers (the secondary node in the example below) with the following command