See the following for reference:
https://guides.github.com/features/mastering-markdown/
https://help.github.com/articles/about-writing-and-formatting-on-github/

DoD:

Create a markdown file to describe the app created in DOCS-11367
Provide a brief overview of the app.
Write a description of each method in the main class for this app.
The format should show the code for the method followed by a description of the MongoDB query in the method.