#161851928 create user endpoint

[mnswaleh]

What does this PR do?

enables creating new user

What does this PR do?

gets the number of delivered orders created by a specific user

Description of Task to be completed?

should have:
1 model method to add user to database
2 POST /users/ endpoint

How should this be manually tested?

1 on postman, enter url http://127.0.0.1:5000/api/v1/users/1
2 send post request with required data
3 should return the user details
4 response code is 201
5 run pytest, the test should pass

What are the relevant pivotal tracker stories?

#161851928

Screenshots (if appropriate)

[coveralls]

Pull Request Test Coverage Report for Build 6

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at ?%

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Totals
Change from base Build 3:	0.0%
Covered Lines:
Relevant Lines:	0

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💛 - Coveralls