Google Apps Script - Record Labeled Gmail Messages into Google Spreadsheet

We need to hire a freelancer to create a script that will copy Gmail messages from specific labels into specific spreadsheets. Ex. In Gmail we have a label called "customer 1" and in in Drive a Spreadsheet called "Customer 1". We need messages from this label to be copied [or Imap] into the specific Spreadsheet. This must be done where different Gmail user email will feed the same spreadsheet. This will help us separate multiple content from a same subject "Customer x" to be viewed by all our staff related to each project related to the "Customer x". Please bid and inform how many hours to accomplish it. Thanks.