CMake: Add preliminary CPack support

We'll tune it later.

PACKAGING.md

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+# Package Generation
+
+This project supports generating both Debian (.deb) and RPM (.rpm) packages
+using CPack.
+
+## Manual Package Generation
+
+### Prerequisites
+
+- CMake 3.16 or later
+- Make or Ninja build system
+- For RPM packages: `rpmbuild` utility
+
+### Build Process
+
+1. **Create build directory:**
+   ```bash
+   mkdir -p build-package
+   cd build-package
+   ```
+
+2. **Configure with CMake:**
+   ```bash
+   cmake .. -DCMAKE_BUILD_TYPE=Release
+   ```
+
+3. **Build the project:**
+   ```bash
+   make -j$(nproc)
+   ```
+
+4. **Generate packages:**
+   ```bash
+   cpack -G DEB    # Generate Debian package
+   cpack -G RPM    # Generate RPM package (requires rpmbuild)
+   ```
+
+### Requirements for RPM Generation
+
+To generate RPM packages, you need `rpmbuild` installed:
+
+- **Ubuntu/Debian**: `sudo apt-get install rpm`
+- **CentOS/RHEL**: `sudo yum install rpm-build`
+- **Fedora**: `sudo dnf install rpm-build`
+
+### Package Contents
+
+The generated packages include:
+
+- **Main executable**: `/usr/bin/salmanoff`
+- **Shared libraries**: `/usr/lib/lib*.so`
+- **Device configurations**: `/usr/share/salmanoff/devices/` (preprocessed
+  .daps files)
+- **Documentation**: `/usr/share/doc/salmanoff/`
+
+### Installing Packages
+
+**Debian/Ubuntu:**
+```bash
+sudo dpkg -i salmanoff-0.00.004-x86_64.deb
+```
+
+**CentOS/RHEL/Fedora:**
+```bash
+sudo rpm -i salmanoff-0.00.004-x86_64.rpm
+```
+
+### Package Configuration
+
+Package metadata and configuration is defined in
+`cmake/CPackConfig.cmake`. This includes:
+
+- Package name, version, and description
+- Dependencies and recommendations
+- License information
+- File naming conventions
+
+### Troubleshooting
+
+- **RPM generation fails**: Ensure `rpmbuild` is installed
+- **Missing dependencies**: Check that all build dependencies are
+  installed
+- **Permission errors**: Ensure you have write permissions in the build
+  directory