Added details on developing to README
Added details on developing to README

NCBI-Hackathons/SRA2R,NCBI-Hackathons/SRA2R,rosachoe/SRA2R,rosachoe/SRA2R,rosachoe/SRA2R,rosachoe/SRA2R,NCBI-Hackathons/SRA2R,NCBI-Hackathons/SRA2R