Signup route happy-path only

[Yorkshireman]

Create a /signup route that creates a user with name, email and password_digest.

Code only happy path; success returns JWT containing database user id. However, include params validation.

[Yorkshireman]

#10

[Yorkshireman]

how to check if token is expired: https://github.com/jwt/ruby-jwt/blob/master/spec/jwt/verify_spec.rb#L64

EDIT: or rather this possibly: https://github.com/jwt/ruby-jwt/blob/master/lib/jwt/verify.rb#L39

[Yorkshireman]

Need to raise unhappy path ticket off the back of this. Probably cover:

• format error responses for:

  • missing params 400 response
  • some sort of params error when not nesting the request body under a user key

• Error when attempting to signup with a duplicate email address