I think that the README could be improved by adding a brief description of how it works, in maybe 20 to 50 words. Then, consider adding another paragraph if mo

I think that the README could be improved by adding a brief description of how it works, in maybe 20 to 50 words. Then, consider adding another paragraph if more detail would be helpful to the reader/prospective user. Separately, a command-line tool to do basic hash verification would also be useful - has anyone seen one?