docs(angular): add code coverage content (#6394)

* docs(angular): add code coverage content

* Update src/data/roadmaps/angular/content/code-coverage@bqA2bxPcZrqQ-6QE-YDK1.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/angular/content/code-coverage@bqA2bxPcZrqQ-6QE-YDK1.md

@@ -1 +1,8 @@
-# Code Coverage
+# Code Coverage
+
+The Angular CLI can run unit tests and create code coverage reports. Code coverage reports show you any parts of your code base that might not be properly tested by your unit tests.
+
+Visit the following resources to learn more:
+
+- [@official@Angular Official Docs - code coverage](https://angular.dev/guide/testing/code-coverage)
+- [@article@Measuring code coverage](https://testing-angular.com/measuring-code-coverage/)