Is your feature request related to a problem? Please describe the impact that the lack of the feature requested is creating.

At the moment we allow applying YAML by pasting/editing it in the Create dialog. However, some users would like to load the YAML directly from a file by loading it from the local machine, or by pointing to a URL.

Describe the solution you'd like

We need a way to load YAML from URL or from a file by having those options in the Create dialog.

Current editor screenshot:

What users will benefit from this feature?

Users who will be able to more easily get their YAML into Headlamp without having to download+open+copy it.

Update: Mockups from Aishwarya Ghatole, LFX mentee:

Important: The UI is not supposed to look exactly like these mockups. Instead we should base the behavior, alignment, etc. on these.