message: docs: add standalone component intro video
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diff: @@ -11,6 +11,8 @@ In v14 and higher, **standalone components** provide a simplified way to build A
  ## Creating standalone components
  +<iframe width="560" height="315" src="https://www.youtube.com/embed/x5PZwb4XurU" title="YouTube video player" frameborder="0" allow="accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
  +
  ### The `standalone` flag and component `imports`
  Components, directives, and pipes can now be marked as `standalone: true`. Angular classes marked as standalone do not need to be declared in an `NgModule` (the Angular compiler will report an error if you try).
  