Update files

Third round of revision:

• Fixed typos in the README.md
• Fixed a typo in the Snakefile
• Fixed the list of samples in the snakemake config.yaml file
• Remove an unnecessary file that was mistakenly uploaded

Upload README and extras

Second round of revision:

• Now including a complete and detailed README.md file
• Added extra files to guide users to reproduce all the analyses

Upload scripts and files

First release:

• Uploaded data files
• Uploaded metadata files
• Uploaded data analysis scripts
• Uploaded plotting scripts