chore: add readme and vim help docs

[smnatale]

Description

add readme and help docs

Screenshots/Images

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1ecb33d0-7de4-4721-9f37-fce7a688499c

📥 Commits

Reviewing files that changed from the base of the PR and between 7f009f7 and 52b850f.

📒 Files selected for processing (2)

• README.md
• doc/coderabbit.txt

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