docs: add readme to run example tests (#52)

Author: timdeschryver

src/app/examples/README.md

@@ -0,0 +1,11 @@
+# 🦔 Angular Testing Library Examples
+
+Follow these three steps to run the example tests:
+
+- clone or download the repository
+- move into the repository and install the needed dependencies with `npm install`
+- use the command `npm run test:app` from within the root of this repository to run the tests
+
+The tests in this repository are written with [Jest](https://jestjs.io/), but you can use the test runner of your choice.
+
+If you're looking for an example that is not in this repository, feel free to create an [issue](https://github.com/testing-library/angular-testing-library/issues/new).