201-logic-app-transform-function does not provide information on how to use

The project https://github.com/Azure/azure-quickstart-templates/tree/master/201-logic-app-transform-function looks interesting, but it is missing details on how to actually use this azure function.

Would really help if a small documentation would be written how to build up the payload for the azure function.

Start in the 201-logic-app-transform-function template linked in the issue and inspect the Azure Function entry point to determine the expected payload. Document the payload structure and explain how to use the function, including the build or setup steps supported by the template. Done means a newcomer can construct a valid payload and follow the usage instructions.

Written by the indexing model from the issue text.