Added HackerRank info to the development list

README.md

@@ -170,6 +170,7 @@ Please note a passing build status indicates all listed APIs are available since
 | Genderize.io | Determines a gender from a first name | No | Yes | [Go!](https://genderize.io) |
 | Github - User Data | Pull public information for a user's github | No | Yes | [Go!](https://api.github.com/users/hackeryou) |
 | Gitter | Chat for GitHub | `OAuth` | Yes | [Go!](https://developer.gitter.im/docs/welcome) |
+| HackerRank | Compile source code and run against a set of provided test cases | `apiKey` | Yes | [Go](https://www.hackerrank.com/api/docs) |
 | Hipster Ipsum | Generates Hipster Ipsum text | No | No | [Go!](http://hipsterjesus.com/) |
 | IPify | A simple IP Address API  | No | Yes | [Go!](https://www.ipify.org/) |
 | JSON 2 JSONP | Convert JSON to JSONP (on-the-fly) for easy cross-domain data requests using client-side JavaScript | No | Yes | [Go!](https://json2jsonp.com/) |