[software] Add data generation README.md

software/data/README.md

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+# Data Generation
+
+Data for mempool applications is generated with the `gendata_header.py` script.
+The `gendata_*.py` libaries contain the golden models for the applications under test.
+The application parameters are passed to the script by means of the `gendata_params.hjson` file.
+
+## To test a new application:
+If a new application requires to be tested with data generated from a reference golden model:
+- Add a new golden model to the existing libraries, or create a new one.
+- Add a golden model function call to the `gendata_header.py`.
+- Add a new item in the `gendata_params.hjson` to make function parameters configurable.