Add standalone components in angular

src/data/roadmaps/angular/content/112-creating-a-custom-x/103-standalone-component.md

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+# Standalone Component
+
+Standalone components provide a simplified way to build Angular applications. Standalone components, directives, and pipes aim to streamline the authoring experience by reducing the need for NgModules. Existing applications can optionally and incrementally adopt the new standalone style without any breaking changes.
+
+Visit the following resources to learn more:
+
+- [Angular Website](https://angular.io/guide/standalone-components)