Merge pull request #1 from eloylp/validate-minimum-config

Add minimum input validation

Great! Thanks @eloylp ! new release!

feat: use Pasword Based Key Derivation Function to get a secure key b…

…ased on password

Thanks to @psanford (github id) Peter Stanford for this: https://gophers.slack.com/archives/C02A3DRK6/p1659185759603659

feature: Ask for password confirmation on encryption

chore: add Makefile and .gitignore