minor fix in contrib/README.md

Author: kdatta

contrib/README.md

@@ -10,6 +10,7 @@ developer_githubid)
 
 ## Checklist before creating Pull Request
 Please ensure the following before creating a pull request
+
 1. Code is well documented in javadoc style
 2. Include a README.md in markdown so that we can add it to Wiki
    - Clearly state what is the key contribution and what problem it solves