docs(angular): add switch content (#6842)

src/data/roadmaps/angular/content/switch@nZuim4Fjq6jYOXcRTAEay.md

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 # @switch
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+The `@switch` blocks displays content selected by one of the cases matching against the conditional expression. The value of the conditional expression is compared to the case expression using the `===` operator. `@switch` does not have fallthrough, so you do not need an equivalent to a break or return statement.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - @switch](https://angular.dev/guide/templates/control-flow#switch-block---selection)
+- [@article@Angular @switch: Complete Guide](https://blog.angular-university.io/angular-switch/)