[Repo Assist] Add Deedle.ExcelWriter; rename Deedle.Excel.Reader → Deedle.ExcelReader#717

dsyme merged 3 commits intomasterfslaborg/Deedle:masterfrom

repo-assist/fix-713-714-excel-packages-c9b45bcefbde7c0efslaborg/Deedle:repo-assist/fix-713-714-excel-packages-c9b45bcefbde7c0eCopy head branch name to clipboard