Documents project structure and TODOs

Adds initial documentation outlining the project's architecture and key features.

Includes a high-level overview of the project's purpose, features, development stack, security considerations, and directory structure.

Also introduces a TODO list outlining planned features and enhancements in subsequent development phases.

The structure emphasizes clarity and maintainability.

docs/TODO.md

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+## Phase 1: Core UI Foundation and Design System
+- [x] Create modern design system in index.css - professional tech recruitment theme
+- [x] Update index.html with proper project metadata
+- [x] Create HomePage.tsx with hero section and job listings layout
+- [x] Implement basic job card components with MiniMax branding
+
+## Phase 2: Data Management with Security
+- [x] Create secure data management system with hidden access code (1408)
+- [x] Implement XLSX/JSON data import functionality with validation
+- [x] Create admin interface with authentication for CRUD operations
+- [x] Build data storage using localStorage with XOR encryption
+- [x] Add security features: hash validation, brute force protection, history versioning
+- [x] Enhanced UI with priority-based design (red/orange/blue borders and badges)
+- [x] Advanced search and filtering (keyword + department + priority filters)
+
+## Phase 3: Interactive Features
+- [ ] Add job search and filtering capabilities
+- [ ] Implement job detail modal/page
+- [ ] Add copy-to-share functionality for job links
+- [ ] Create responsive mobile-friendly interface
+
+## Phase 4: Polish and Enhancement
+- [ ] Add smooth animations and micro-interactions
+- [ ] Implement error handling and loading states
+- [ ] Add SEO optimization and meta tags
+- [ ] Final UI polish and performance optimization