[travis] convert README to markdown format so build image can be displayed

README → README.md

 Yahoo! Cloud System Benchmark (YCSB)
 ====================================
+[![Build Status](https://travis-ci.org/brianfrankcooper/YCSB.png?branch=master)](https://travis-ci.org/brianfrankcooper/YCSB)
 
 Links
 -----
-http://wiki.github.com/brianfrankcooper/YCSB/
-http://research.yahoo.com/Web_Information_Management/YCSB
-ycsb-users@yahoogroups.com
+http://wiki.github.com/brianfrankcooper/YCSB/  
+http://research.yahoo.com/Web_Information_Management/YCSB/  
+ycsb-users@yahoogroups.com  
 
 Getting Started
 ---------------
 
 1. Download the latest release of YCSB:
 
+    ```sh
     wget https://github.com/downloads/brianfrankcooper/YCSB/ycsb-0.1.4.tar.gz
     tar xfvz ycsb-0.1.4
     cd ycsb-0.1.4
-
-2. Set up a database to benchmark. There is a README file under each binding
+    ```
+    
+2. Set up a database to benchmark. There is a README file under each binding 
    directory.
 
 3. Run YCSB command. 
-
+    
+    ```sh
     bin/ycsb load basic -P workloads/workloada
     bin/ycsb run basic -P workloads/workloada
+    ```
 
-   Running the `ycsb` command without any argument will print the usage. 
+  Running the `ycsb` command without any argument will print the usage. 
    
-   See https://github.com/brianfrankcooper/YCSB/wiki/Running-a-Workload
-   for a detailed documentation on how to run a workload.
+  See https://github.com/brianfrankcooper/YCSB/wiki/Running-a-Workload
+  for a detailed documentation on how to run a workload.
 
-   See https://github.com/brianfrankcooper/YCSB/wiki/Core-Properties for 
-   the list of available workload properties.
+  See https://github.com/brianfrankcooper/YCSB/wiki/Core-Properties for 
+  the list of available workload properties.