Add Measles_File_Prep script

[AbbeyM1]

Add script too merge measles fastas and create date file for phylogenetic analysis

[erinyoung]

In the Readme of this repo, we have a few lines about each script that includes what it is intended to do and how it does it.

Does something like the following seem okay?

Measles_File_Prep.py

This script automates data preparation for phylogenetic analysis by merging individual FASTA files into consolidated datasets while renaming sequence headers to match their original filenames. It also processes a metadata spreadsheet to extract and clean specific accession IDs and collection dates, saving them into a simplified tab-separated text file.

EXAMPLE:

python Measles_File_Prep.py