README/ Doc Addressing Alternative HL7 Libraries

[cancan101]

I have so far found three HL7 libraries in Python: https://github.com/johnpaulett/python-hl7, https://github.com/crs4/hl7apy, https://github.com/mps-gmbh/hl7-parser, https://github.com/flrt/hl7tersely and https://github.com/norlowski/HL7py.

A doc outlining the major differences would be great.

[ciroiriarte]

This one talks about python-hl7 and hl7apy: https://www.ejbi.org/scholarly-articles/hl7apy-a-python-library-to-parse-create-and-handle-hl7v2x-messages.pdf