Refactor entry to store some information like username, password and website
Dir should include this entry
Add validator with spec
Add password validator with specs
Use password validator in entry for checking passwords
Add tags and tag with specs and use it in entry
Move validators to separate directory
Add command base with specs
Add tree singleton class for root instance with specs
Add command touch with specs
Add Dir#clear with spec
Add tree clearing before each test to command_spec
Add mkdir command with specs