docs(angular): add attribute-directives content (#6523)

src/data/roadmaps/angular/content/attribute-directives@xvwby0FTdIolRrV2j88fY.md

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 # Attribute Directives
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+Change the appearance or behavior of DOM elements and Angular components with attribute directives.
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+The most used attribute directives are:
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+- ngClass
+- ngStyle
+- ngModel
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Attribute Directives](https://angular.dev/guide/directives/attribute-directives)
+- [@article@Angular Attribute Directive](https://www.scaler.com/topics/angular/angular-attribute-directive/)