docs(angular): add defer content (#6388)

src/data/roadmaps/angular/content/defer@ONy-0olujU_FGZM7Wvfr2.md

@@ -1 +1,9 @@
-# @defer
+# @defer
+
+A type of block that can be used to defer load the JavaScript for components, directives and pipes used inside a component template.
+
+Visit the following resources to learn more:
+
+- [@official@Angular Official Docs - @defer](https://angular.dev/api/core/@defer)
+- [@article@Angular Defer Complete Guide](https://blog.angular-university.io/angular-defer/)
+- [@article@How to use Angular's defer block to improve performance](https://angular.love/en/how-to-use-angulars-defer-block-to-improve-performance)