Add License and Contributing

[lachellel]

For govt compliance purposes, a License.md and Contributing.md needs to be added.

• A sample License.md: https://github.com/GSA/piv-guides/blob/staging/LICENSE.md
• A sample Contributing.md: https://github.com/GSA/piv-guides/blob/staging/CONTRIBUTING.md
  • The Contributing.md needs the Licensing disclaimer primarily

[bob-fontana]

Thanks LRL.

[bob-fontana]

Fixed