Added new doc for running tests in chrome

Made shorter

docs/running_behat_tests_using_chrome.md

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+#Running Behat Tests using Chrome
+If you would like to run Behat Tests using Google Chrome here are a few steps I went through to get that setup.
+
+1) [Download the Google Chrome Webdriver](http://chromedriver.storage.googleapis.com/index.html?path=2.8/)
+
+2) Unzip the file, and place the chromedriver file in a known location.
+
+3) Now edit the `behat.yml` file and create a new profile for using Chrome by adding the following below the default profile.
+
+```
+      default_session: selenium2
+      javascript_session: selenium2
+      goutte: ~
+      selenium2:
+        browser: chrome
+    SilverStripe\BehatExtension\Extension:
+      screenshot_path: %behat.paths.base%/_artifacts/screenshots
+```
+
+4) Now we need to use the new webdriver with Selenium. 
+
+```
+java -jar selenium-server.jar -Dwebdriver.chrome.driver="/path/to/chromedriver"
+```
+
+5) Now run your behat steps with the chrome profile.
+
+```
+behat @mysite --profile=chrome
+```