Help in Extension development

Hi there. I am a student and new to extension building. I am trying build an extension with the help of SDK documentations.

First of all It guides us to Import Gradle Dependency. How can I do that

Secondly, How can I define XML or basic design for my extension (such as width, height, etc.)

I am really looking forward to some help

Regards
Swayam

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Taifun