covid19swiss 0.1.0

• Added a NEWS.md file to track changes to the package.
• Created the following vignettes:
  • Introduction to the covid19swiss Dataset
  • Updating the covid19swiss Dataset
  • Geospatial Visualization of Switzerland Cantons (non CRAN vignette)
• Created a package site
• Added the update_swiss_data function to keep the installed version updated with the Dev version
• Added the refresh_covid19swiss and get_info_covid19swiss functions to incorporate the data in the covid19R package