UserLoans#create | POST "api/v1/users/:id/loans"

[kem247]

Changes:

• added a routes path, controller method , and testing to create a new loan between an owner, their puzzle and a borrower

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This is related to #34

This closes #34

[x] I linted my work. (RuboCop)

[] I've updated documentation & README. (if necessary)

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Link:

[MelTravelz]

Ah, I see RuboCop changed some of our Condrollers from something like:
Api::V1::Users::PuzzlesController < ApplicationController

into:
module Api
module V1
module Users
class PuzzlesController < ApplicationController

It's ok and doesn't hurt anything, but please don't just accept all changed from RuboCop...sometimes it gives bad advice