Add documentation for Cucumber Test Framework

[tapaswenipathak]

• Draft documentation for QA/testers on how to write new tests and leverage the Cucumber Test framework
• Draft documentation for developers on how to write code leveraging new Cucumber test framework for unit testing

ref openMF/mifos-documentation#14.

cc @edcable.

Description

Describe the changes made and why they were made.

Ignore if these details are present on the associated Apache Fineract JIRA ticket.

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