Add Postman collection

[billglover]

Fix #62 by creating a skeleton Postman collection.

The skeleton collection enables the following features:

• use random data for all requests
• create user (capture token, username and password in variables)
• login (capture token in variable)
• list resources (use token for auth)
• create resource (use token for auth)

[billglover]

Ready for review.

[lpatmo]

@sebbel, @albertfougy, and I reviewed in a hangout! Thanks so much Bill!