Flesh this type out further to support HMAC.  Added constructor.
Refactored crypto services.  HMAC related method isolated in its own interface.  Encryption has its own interface.  Different usage / consumers.
Added this project to include implementation of domain-layer cryptography services.
Add Infrastructure.Cryptography
Update token constructor.  Flesh out logic for Generate and Validate.
Add Netwonsoft Json Serializer package.