docs(angular): add model-inputs content (#6471)

src/data/roadmaps/angular/content/model-inputs@IeU6ClS_yp6BYKdkQOJVf.md

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 # Model Inputs
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+Model inputs are a special type of input that enable a component to propagate new values back to another component.  Use model inputs in components that exist to modify a value based on user interaction.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Model Inputs](https://angular.dev/guide/signals/model)
+- [@video@Angular's New Model Inputs: Two-way Communication with your Child Components](https://www.youtube.com/watch?v=frXIBKqzTK0)
+- [@article@Angular Model Inputs: Two-way binding inputs with signals](https://www.codemotion.com/magazine/frontend/angular-model-inputs-two-way-binding-inputs-with-signals/)
+- [@article@Model Inputs: Reactive two-way binding ](https://dev.to/this-is-angular/model-inputs-reactive-two-way-binding-2538)