Implement the UI + basic Logic

[NghiaTranUIT]

Acceptance Criteria

• Use Radix UI to implement the UI (Discuss later)
• Dropdown button to switch Diff Mode: Inline or Side by Side
• Use language = JSON as default
• When the website is loaded, a Sample JSON for the Left / Right panel should be filled.
• Clipboard to paste to the left or Right Panel
• Use Navigation Menu on the Top-Right Corner
• Swap content of the left and Right