Update readme file with more info about how to run the tests

Also, add pipeline badge in the new build status sub-section.

README.md

@@ -14,9 +14,15 @@ You will need [Node](http://nodejs.org) and NPM to run the tests for this sample
 
 Run `npm i` to install the dev dependencies.
 
-## Running tests in interactive mode
+## Running tests
 
-Run `npx cypress open` to open cypress, then click the **Run all specs** button to run the tests.
+Run `npx cypress open` to open cypress, then click the **Run all specs** button to run the tests in interactive mode.
+
+Or run `npx t` to run the tests in headless mode.
+
+### Build status
+
+[![Build Status](https://gitlab.com/wlsf82/sample-app/badges/master/build.svg)](https://gitlab.com/wlsf82/sample-app)
 
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