[Samsung][docs] Update to the new template

[SS-JIA]

Summary:
Title says it all!

Add docs for the Samsung backend based on the template introduced in #14873.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15087

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[digantdesai]

Thanks @SS-JIA. Let's get it reviewed by someone at Samsung? Stamping to unblock merging if you have to.

[Jiseong-oh]

Thanks @SS-JIA. Let's get it reviewed by someone at Samsung? Stamping to unblock merging if you have to.

@SS-JIA , @digantdesai We agree to use this document for exynos backend.