Tutorial for backend testing

[sindhukrovvidi]

• tutorials for testing RESTful APIs and testing backend functions by accessing MongoDB.
• useful links for testing documents

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[jon-bell]

Suggestions:

• Start with mocks (instead of end with mocks)
• Describe why mocks can be preferable
• Use mocks to show how to test client application (by mocking the server)
• Consider using the "transcript server" as the codebase for the tutorial: we could write some new methods that happen in the client (e.g. calculating average grades), and then test that method using a mock server.
• Consider adding more discussion of some of the examples in the codebase currently (particularly for jest-mock-extended)