A csv file is not a binary file, meaning you can read it in a text editor. You can also use Google Docs. What you need to do, is create a Google spreadsheet, or use Excel. Put min as the header of the first column and max as a header for the second column, fill in the values, and save it as a .csv.

Make sure its formatted as it should be.

I don’t work in R or python but if you are having an issue there almost assuredly is a specific field that need to be populated defining min and max. Probably in the header of the file.