docs(angular): add setting up http client content (#6525)

src/data/roadmaps/angular/content/setting-up-the-client@AKPhbg10xXjccO7UBh5eJ.md

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 # Setting Up the Client
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+Before you can use `HttpClient` in your app, you must configure it using dependency injection. `HttpClient` is provided using the `provideHttpClient` helper function, which most apps include in the application providers in `app.config.ts`. If your app is using NgModule-based bootstrap instead, you can include `provideHttpClient` in the providers of your app's `NgModule`.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Setting up HttpClient](https://angular.dev/guide/http/setup)
+- [@video@Setting up HttpClient in Angular (NgModule)](https://www.youtube.com/watch?v=hBFtim1vO3M)