ces 0.1.0

• Initial release
• Added functions for accessing Canadian Election Study datasets:
  • get_ces() - Download and load CES data for a specific year
  • list_ces_datasets() - List available CES datasets
  • get_ces_subset() - Get a subset of variables from a CES dataset
  • create_codebook() - Generate a comprehensive codebook for CES datasets
  • export_codebook() - Export codebooks to CSV or Excel formats
  • examine_metadata() - Analyze metadata across variables in a dataset
  • download_pdf_codebook() - Download official PDF codebooks for any CES year
  • download_ces_dataset() - Download a single CES dataset by year
  • download_all_ces_datasets() - Download all or selected CES datasets at once
• Enhanced metadata preservation:
  • Metadata preservation is now enabled by default
  • All variable labels and value labels are automatically maintained
  • Complete preservation of original dataset attributes for better data documentation
• Supported datasets from 1965 to 2021
• Added vignette and examples
• Included support for variable documentation and metadata exploration