Configure the azure-functions projects first (read the README file in the azure-functions folder). Once complete, you can use the mock-image-uploader to push a test image into the expense-processor pipeline.
For a deeper dive into the details and context behind this code repository, please refer to http://blog.codemoggy.com/index.php/2017/06/20/using-azure-functions-to-enable-ocr-processing-of-images/