docs: "command not found: gollama"

[KimCookieYa]

Description

• This PR adds instructions for setting environment variables to resolve the command not found: gollama error.
• Without this setup, some users might encounter issues when running the gollama command after installation.

[llamapreview]

Auto Pull Request Review from LlamaPReview

Review Status: Automated Review Skipped

Dear contributor,

Thank you for your Pull Request. LlamaPReview has analyzed your changes and determined that this PR does not require an automated code review.

Analysis Result:

PR only contains documentation changes (1 files)

Technical Context:

Documentation changes typically include:

• Markdown/RST file updates
• API documentation
• Code comments
• README updates
• Documentation in /docs directory
• License and contribution files

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[sammcj]

LGTM, thanks!