feat: Implement core functionality for DTC C/C++ IDE

- Added ProjectManager class to handle project operations including opening, closing, building, and running projects.
- Introduced SyntaxHighlighter class for syntax highlighting in C and C++ files.
- Developed TerminalWidget for command execution and output display.
- Created TextEditor with line numbering and auto-indentation features.
- Established main application entry point in main.cpp.
- Designed UI layout for MainWindow using Qt Designer.

plan.md

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+# Development Roadmap
+
+## Phase 1: Core Features
+- [ ] Create basic text editor component
+- [ ] Syntax highlighting using ANTLR grammar
+- [ ] File tree browser
+- [ ] Integrated terminal emulator
+- [ ] CMake project detection
+
+## Phase 2: Advanced Features
+- [ ] LLDB debugger integration
+- [ ] Autocomplete using clang-tidy
+- [ ] Project templates
+- [ ] Dark/Light theme switching
+- [ ] Git integration basics
+
+## Phase 3: Polish
+- [ ] Code formatting (clang-format integration)
+- [ ] Documentation viewer
+- [ ] Customizable keybindings
+- [ ] Plugin system architecture
+- [ ] Performance optimization
+
+## Milestones
+1. MVP (v0.1) - Basic editor + build system
+2. Debug Preview (v0.5) - Integrated debugging
+3. Release Candidate (v1.0) - Full feature set
+
+## Development Environment
+- Primary Language: C++20
+- GUI Framework: Qt 6
+- Build System: CMake
+- Continuous Integration: GitHub Actions