docs(angular): add routing content (#6452)

src/data/roadmaps/angular/content/routing@8i_JD1P4gIhY1rdldwLC2.md

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 # Routing
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+Tracking and controlling focus in a UI is an important consideration in designing for accessibility. When using Angular routing, you should decide where page focus goes upon navigation.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - a11y routing](https://angular.dev/best-practices/a11y#routing)
+- [@article@Accessibility - Focus](https://web.dev/learn/accessibility/focus/)
+- [@article@Router events in Angular](https://medium.com/@gurunadhpukkalla/router-events-in-angular-3112a3968660)