docs(angular): add route transitions content (#6558)

src/data/roadmaps/angular/content/route-transitions@x91jWP81oCTeVEwzX8FbK.md

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 # Route Transitions
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+When a user navigates from one route to another, the Angular router maps the URL path to a relevant component and displays its view. Animating this route transition can greatly enhance the user experience.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Route transition animations](https://angular.dev/guide/animations/route-animations)
+- [@article@Add router animation trnasitions for navigation in Angular 17](https://dev.to/this-is-angular/add-router-animation-transitions-for-navigation-in-angular-17-2m5a)
+- [@video@Angular Animations: Router transitions](https://www.youtube.com/watch?v=7d8UDEKT1pU)