docs: add Tamazight (Latin script) README translation

[Untitled-Master]

Issue for this PR

Closes #18214

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Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

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What does this PR do?

This PR adds a Tamazight (Latin script) translation of the main README.

• Created README.ber.md with translated content
• Added Tamazight to the language navigation in README.md

The goal is to make the project more accessible to Tamazight-speaking developers across North Africa, where the Latin script is commonly used in technical contexts.

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How did you verify your code works?

• Checked that the new README renders correctly on GitHub
• Verified links and formatting are consistent with other translations
• Ensured the language switch link points to the correct file

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Screenshots / recordings

N/A (documentation change only)

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Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title Add Tamazight (Latin script) translation for README doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate: