[DOCS] Update README

[yubin012]

Added technology stack badges and updated PR and code review sections with images.

📝 작업 내용

이번 PR에서 작업한 내용을 적어주세요

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: c39a2da4-5bb9-4ed5-a3a3-22195d0a89f2

📥 Commits

Reviewing files that changed from the base of the PR and between da459dc and 95dd471.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yubin012-patch-6

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