Implement the SSH and USER commands

NOTES.md

ask/ask.go

key/key.go

repl/accounts.go

repl/command.go

storage/display.go

storage/migrations/1_create_table.up.sql

storage/queries/seed.sql

storage/queries/standard.sql

storage/queries/users.sql

storage/seed.sql.go

storage/standard.sql.go

storage/users.sql.go

users/users.go