Document the Data Encoder process

[atarora]

The dataencoder process currently is part of the chorus repo. It misses the README and the steps required to run and (if required) customise based on the chosen transformer.

[mkr]

Thanks, please document the steps I need to run this locally. Also, we need some kind of dependency file, i.e. a requirements.txt for pip or a pyproject.toml for poetry.

[atarora]

Addressed as part of : https://github.com/querqy/chorus/pull/152/files. I think the issue can be closed now.