feat(calm-hub-ui): update documentation for e2e tests

Author: YoofiTT96

calm-hub-ui/README.md

@@ -19,7 +19,18 @@ You may also see any lint errors in the console.
 Launches the test runner in the interactive watch mode.\
 See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
 
-### `npm e2e`
+### `npm run start-cypress`
+
+End to End tests are written with cypress. Cypress can be run in headless and headed modes. 
+The above command runs in headed mode and allows the developer to locally run through the spec 
+files and observe the test runs. [React Testing Library](https://testing-library.com/docs/react-testing-library/intro/) queries and paradigm for testing features 
+heavily in these tests as these help maintainability by organising tests around how the UI is used
+and not how its implemented. [Cypress and its best practices](https://docs.cypress.io/app/core-concepts/best-practices) are also used in writing and updating
+these tests.
+
+#### Test Stubbing
+The tests are all stubbed to return desired responses. These will need to be maintained in tandem with 
+calm-hub API. This section can be updated when a different and more reliable integration strategy is devised
 
 
 ### `npm run build`