fix set up with first tutorial

docs/content/Tutorial:-A-First-Look-at-Druid.md

@@ -73,6 +73,26 @@ You should see a bunch of files:
 * run_example_client.sh
 * LICENSE, config, examples, lib directories
 
+
+## External Dependencies
+
+Druid requires 3 external dependencies. A "deep storage" that acts as a backup data repository, a "metadata storage" such as MySQL to hold configuration and metadata information, and [Apache Zookeeper](http://zookeeper.apache.org/) for coordination among different pieces of the cluster. For this tutorial, we only need the zookeeper dependency.
+
+#### Set up Zookeeper
+
+```bash
+Download zookeeper from [http://www.apache.org/dyn/closer.cgi/zookeeper/](http://www.apache.org/dyn/closer.cgi/zookeeper/)
+Install zookeeper.
+
+e.g.
+curl http://www.gtlib.gatech.edu/pub/apache/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz -o zookeeper-3.4.6.tar.gz
+tar xzf zookeeper-3.4.6.tar.gz
+cd zookeeper-3.4.6
+cp conf/zoo_sample.cfg conf/zoo.cfg
+./bin/zkServer.sh start
+cd ..
+```
+
 Running Example Scripts
 -----------------------