docs(vi): add Vietnamese getting started guide draft

[maitamdev]

Adding a draft of the Vietnamese (vi) getting started guide to help Vietnamese developers begin their open source journey.

This is a starting point that can be expanded by Vietnamese-speaking contributors.

[Copilot]

Pull request overview

Adds an initial Vietnamese (“vi”) getting-started guide draft intended to help Vietnamese developers begin contributing to open source.

Changes:

• Introduces a new Vietnamese article file for a getting-started guide draft.

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[Copilot]

This new article is missing the YAML front matter that the articles Jekyll collection relies on (e.g., ---\nlang: vi\ntitle: ...\ndescription: ...\nclass: ...\norder: ...\n---). Without front matter, Jekyll will treat this as a static file and it won’t be rendered with the article layout or included in the collection output as intended.

Suggested change

	# Huong dan dong gop ma nguon mo
	---
	lang: vi
	title: Huong dan dong gop ma nguon mo
	description: Day la huong dan danh cho nguoi Viet Nam bat dau voi open source.
	class: getting-started
	order: 1
	---
	# Huong dan dong gop ma nguon mo

[Copilot]

Line 1 begins with an unexpected UTF-8 BOM character (invisible \ufeff) before the #, which can cause inconsistent rendering/tooling behavior. Also, since this is a Vietnamese guide, the title/intro should use proper Vietnamese diacritics (e.g., “Hướng dẫn đóng góp mã nguồn mở”, “Đây là hướng dẫn…”).

Suggested change

	# Huong dan dong gop ma nguon mo
	Day la huong dan danh cho nguoi Viet Nam bat dau voi open source.
	# Hướng dẫn đóng góp mã nguồn mở
	Đây là hướng dẫn dành cho người Việt Nam bắt đầu với open source.