Updated README with link to Parallel Test Calculator

Author: rhlbhatnagar

README.md

@@ -13,8 +13,11 @@
 ## Running your tests
 
 - To run a single test, run `mvn test -P single`
-- To run parallel tests, run `mvn test -P parallel`
 - To run local tests, run `mvn test -P local`
+- To run parallel tests, run `mvn test -P parallel`
+
+ Understand how many parallel sessions you need by using our [Parallel Test Calculator](https://www.browserstack.com/automate/parallel-calculator?ref=github)
+
 
 ## Notes
 * You can view your test results on the [BrowserStack Automate dashboard](https://www.browserstack.com/automate)