fix: resolve #95 — Document local setup for all Sentri services

[andoan16]

Summary

fix: resolve #95 — Document local setup for all Sentri services

Problem

Severity: High | File: README.md

The root README needs a clear local setup section that covers all three services (Expo app, Spring Boot backend, and Python ML worker) with prerequisites, setup steps, and verification commands. This will help new contributors get started quickly without guessing.

Solution

Add a new section "Local Development Setup" after the introduction that includes:

Changes

• README.md (modified)
• .github/CONTRIBUTING.md (modified)

Testing

• Existing tests pass
• Manual review completed
• No new warnings/errors introduced

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2caba7f9-c49b-461d-964f-8d3736b82947

📥 Commits

Reviewing files that changed from the base of the PR and between 3cb6041 and 8dbce56.

📒 Files selected for processing (2)

• .github/CONTRIBUTING.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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