refine readme

README.md

@@ -1,6 +1,6 @@
 ##Compile Hadoop in Docker container
 
-To comile [Hadoop](http://archive.apache.org/dist/hadoop/core/), just run with your prefered VERSION
+####To comile [Hadoop](http://archive.apache.org/dist/hadoop/core/), just run with your prefered VERSION
 
 ```
 sudo ./run.sh [VERSION]
@@ -12,10 +12,18 @@ For example, to compile Hadoop 2.3.0:
 sudo ./run.sh 2.3.0
 ```
 
-The **run.sh** script will:
+
+####The **run.sh** script will:
 
 1. Build **kiwenlau/compile-hadoop** image
 
 2. Start a container, **compile.sh** will execute within the container to compile Hadoop.
 
-3. You will get compiled Hadoop in **compile-hadoop/binary** directory
+3. You will get compiled Hadoop in **compile-hadoop/binary** directory
+
+
+####To download compiled Hadoop:
+
+```
+wget wget https://github.com/kiwenlau/compile-hadoop/releases/download/2.3.0/hadoop-2.3.0.tar.gz
+```