Add the ability to create a user account

[Christian-Toney]

### Completion criteria for developers
- [ ] Install [argon2 package](https://www.npmjs.com/package/argon2)
- [ ] Add endpoint: `PUT` `/accounts/user`
- [ ] Add property: `accountID`
- [ ] Add property: `loginID`
- [ ] Add property: `permissions`
- [ ] Add optional property: `flag`
- [ ] Add encrypted property: `encryptedEmailAddress`
- [ ] Add encrypted property: `encryptedPassword`
- [ ] Add encrypted property: `encryptedBirthDate`
- [ ] Save account information in the database
- [ ] Return a `201` on success