[story] AP-2423: coded ui test docs

[michaelfich]

Jira Ticket:

• https://quandl.atlassian.net/browse/AP-2423

Description

Added a README.md file within the Quandl.Test.CodedUI directory which includes instructions for adding or editing the Coded UI Tests used within this project.

Note to the reviewer

• The instructions should be read to ensure that they could be reasonably understood by a developer who is not familiar with the process.

Note to QA

• None

Dependency

• None