[MAINTENANCE] Add instructions for setting up the test_ci database

[anthonyburdi]

Changes proposed in this pull request:

• Add some brief instructions for running tests via mssql in a readme

Definition of Done

• My code follows the Great Expectations style guide
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation

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[Shinnnyshinshin]

Very helpful :) thank you @anthonyburdi