feat(challenge28): testing a simple checkbox

apps/testing-checkbox/README.md

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+<h1>Test of a simple checkbox</h1>
+
+> Author: Thomas Laforge
+
+### Information
+
+This is the perfect example to get started with `Testing Library`.
+
+You will need to only check if the button gets enabled when clicking on the checkbox
+
+You can look into debug function to get full power of `Testing Library` like:
+
+- logRoles(...);
+- screen.debug(); // you can pass a element as input
+- screen.logTestingPlaygroundURL(); // you can pass a element as input
+
+### Submitting your work
+
+1. Fork the project
+2. clone it
+3. npm ci
+4. `npx nx serve testing-checkbox`
+5. _...work on it_
+6. Commit your work
+7. Submit a PR with a title beginning with **Answer:28** that I will review and other dev can review.
+
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A28+label%3Aanswer"><img src="https://img.shields.io/badge/-Solutions-green" alt="testing-checkbox"/></a>
+<a href='https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A28+label%3A"answer+author"'><img src="https://img.shields.io/badge/-Author solution-important" alt="testing-checkbox solution author"/></a>
+
+<!-- <a href="{Blog post url}" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/badge/-Blog post explanation-blue" alt="testing-checkbox blog article"/></a>  -->
+
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank" rel="noopener noreferrer"><img src="./../../logo/twitter.svg" height=20px alt="twitter"/></a>