Add command-line arguments
Used argparse package to add command-line arguments for the 4 inputs: FASTA sequences, counts CSV, and mean+std fragment lengths. Included check that FASTA and CSV file paths are valid.
Used argparse package to add command-line arguments for the 4 inputs: FASTA sequences, counts CSV, and mean+std fragment lengths. Included check that FASTA and CSV file paths are valid.