updated readme to run test suite (#17)

Author: swapnilagarwwal

README.md

@@ -17,6 +17,7 @@ Master branch contains **Selenium 3** samples, for **Selenium 4 - W3C protocol**
 - To run a single test, run `mvn test -P single`
 - To run local tests, run `mvn test -P local`
 - To run parallel tests, run `mvn test -P parallel`
+- To run the test suite, run `mvn test -P suite`
 
  Understand how many parallel sessions you need by using our [Parallel Test Calculator](https://www.browserstack.com/automate/parallel-calculator?ref=github)