Add default validation groups

[petergmurphy]

This issue specifies what's expected when implementing the addition of default validation groups.

Acceptance criteria:

• Create a validate.yml file with the prm validate init command in the user's code directory that is set up with default groups e.g. linters, git, etc.
  • Add a property to the ~/.config/.prm-config.yaml file that, if set to true, will prevent a default validate.yml file from being created inside a user's code dir.
  • Only create this file if it does not exist and the config property pertaining the validate.yml file creation is false.
• Add appropriate unit and acceptance tests.