docs(angular): add making requests content (#6526)

src/data/roadmaps/angular/content/making-requests@HjGAv3aV-p4ijYJ8XYIw3.md

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 # Making Requests
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+`HttpClient` has methods corresponding to the different HTTP verbs used to make requests, both to load data and to apply mutations on the server. Each method returns an RxJS `Observable` which, when subscribed, sends the request and then emits the results when the server responds.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Making requests](https://angular.dev/guide/http/making-requests)
+- [@video@How to make HTTP request in Angular 18](https://www.youtube.com/watch?v=3vQpYKlHmS0)