Create a new replacement for this library. Allows single replacement creation as JSON object. Also allows bulk upload using a CSV with a format matching WellSaid Labs Studio. There are 2 options for the bulk upload from CSV, either including the file as a "multipart/form-data", or just including the contents in the request body.
A CSV can be uploaded to create multiple replacements in a single request. The CSV should be in the form of

Text,Replacement Text,Enabled,Respelling
"360","3 60","true","false"
"affine","uh-FYN","true","true"

With the header row included. The CSV can be uploaded as either the body of the POST request with content-type text/csv, or included as a file with content-type multipart/form-data, and the file included in the file parameter