add usage.txt
add usage.txt

metagenomics/MeRaGENE,metagenomics/bioPipeline,metagenomics/bioPipeline,metagenomics/MeRaGENE,metagenomics/MeRaGENE,metagenomics/MeRaGENE,metagenomics/bioPipeline,metagenomics/bioPipeline