updated readme

Author: tr4n2uil

README.md

@@ -6,10 +6,15 @@
 
 - Clone the repo
 - Install dependencies `npm install`
-- Update `*.conf.js` with your BrowserStack credentials `user` and `key`
+- Update `*.conf.js` files inside the `conf/` directory with your BrowserStack Username and Access Key. (These can be found in the [settings](https://www.browserstack.com/accounts/settings) section on BrowserStack accounts page)
+- Alternatively, you can export the environment variables for the Username and Access Key of your BrowserStack account. `export BROWSERSTACK_USERNAME=<browserstack-username> && export BROWSERSTACK_ACCESS_KEY=<browserstack-access-key>`
 
 ### Run the tests
 
 - To run single test, run `npm run single`
 - To run parallel tests, run `npm run parallel`
 - To run local tests, run `npm run local`
+
+### Notes
+
+- In order to test on different set of browsers, check out our [code generator](https://www.browserstack.com/automate/python#setting-os-and-browser)