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.

build.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+# Build script for DTC C/C++ IDE on macOS
+
+echo "🚀 Building DTC C/C++ IDE for macOS..."
+
+# Check if Qt6 is installed
+if ! command -v qmake6 &> /dev/null && ! command -v qmake &> /dev/null; then
+    echo "❌ Qt6 is not installed. Please install Qt6 first:"
+    echo "   brew install qt@6"
+    echo "   or download from https://qt.io"
+    exit 1
+fi
+
+# Find Qt6 installation path
+QT_PATH=""
+if [ -d "/opt/homebrew/opt/qt@6" ]; then
+    QT_PATH="/opt/homebrew/opt/qt@6"
+elif [ -d "/usr/local/opt/qt@6" ]; then
+    QT_PATH="/usr/local/opt/qt@6"
+elif [ -d "$HOME/Qt" ]; then
+    # Find latest Qt version
+    QT_VERSION=$(ls "$HOME/Qt" | grep "^6\." | sort -V | tail -n1)
+    if [ ! -z "$QT_VERSION" ]; then
+        QT_PATH="$HOME/Qt/$QT_VERSION/macos"
+    fi
+fi
+
+if [ -z "$QT_PATH" ]; then
+    echo "❌ Could not find Qt6 installation. Please set CMAKE_PREFIX_PATH manually."
+    echo "Example: export CMAKE_PREFIX_PATH=/path/to/qt6"
+    exit 1
+fi
+
+echo "✅ Found Qt6 at: $QT_PATH"
+
+# Create build directory
+if [ ! -d "build" ]; then
+    mkdir build
+fi
+
+cd build
+
+# Configure with CMake
+echo "🔧 Configuring project..."
+cmake .. -DCMAKE_PREFIX_PATH="$QT_PATH" -DCMAKE_BUILD_TYPE=Release
+
+if [ $? -ne 0 ]; then
+    echo "❌ CMake configuration failed!"
+    exit 1
+fi
+
+# Build the project
+echo "🔨 Building project..."
+make -j$(sysctl -n hw.ncpu)
+
+if [ $? -ne 0 ]; then
+    echo "❌ Build failed!"
+    exit 1
+fi
+
+echo "✅ Build completed successfully!"
+echo ""
+echo "🎉 DTC C/C++ IDE has been built!"
+echo "📁 Executable location: $(pwd)/dtc-ide.app"
+echo ""
+echo "To run the IDE:"
+echo "   ./dtc-ide.app/Contents/MacOS/dtc-ide"
+echo "   or"
+echo "   open dtc-ide.app"