Provide sample data and instructions

[petersm3]

Provide sample FASTQ file, key file, enzyme file, and retool script to be more infrastructure agnostic, such that it's easy to perform a test run.

[petersm3]

Example where sample data and instructions would be useful for countbarcodes.pl

https://groups.google.com/g/tassel/c/f6Vw9tD3mcI