docs(angular): add resources to rxjs basics (#6919)

src/data/roadmaps/angular/content/rxjs-basics@lfp7PIjwITU5gBITQdirD.md

@@ -3,3 +3,10 @@
 Reactive Extensions for JavaScript, or RxJS, is a reactive library used to implement reactive programming to deal with async implementation, callbacks, and event-based programs.
 
 The reactive paradigm can be used in many different languages through the use of reactive libraries. These libraries are downloaded APIs that provide functionalities for reactive tools like observers and operators. It can be used in your browser or with Node.js.
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+Visit the following resources to learn more:
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+- [@official@RxJS Docs](https://rxjs.dev/guide/overview)
+- [@article@Learn RxJS](https://www.learnrxjs.io/)
+- [@article@RxJs and Observables for Beginners: A Beginner Friendly Introduction](https://blog.angular-university.io/functional-reactive-programming-for-angular-2-developers-rxjs-and-observables/)
+- [@video@Beginner's RxJS Tutorial: Dive Deep with RxJS Crash Course!](https://www.youtube.com/watch?v=yJdh1_FbtjU)