Helpful Information about org.testng : testng : 6.8
Probabibly you will need to find out how to usey this library, we recommend you ask question and connect with people that are using the library here.
How to use the given XML:
Adding org.testng : testng : 6.8 to your maven project is easy, just copy/paste the dependecy XML and paste it to the dependencies node of your pom.xml .
Sometimes it doesn't exist, so just create it and start adding dependecies to your project.