Documentation Suggestion - add a compatibility matrix of OS family, Python version, python-oracledb version

[mikesmithers]

Could a compatibility matrix be included somewhere in the documentation so that it's easy to tell which package version can be used for which OS/Python version - e.g.

Python	Windows	MacOS	Linux
3.6	n/a	n/a	1.4.2
3.7	2.3.0	2.3.0	2.3.0
3.8	3.0.0	3.0.0	3.0.0
3.9	3.4.2	3.4.2	3.4.2

[anthony-tuininga]

This table has been added. It is noted that not all platforms had all versions and that is not documented, but considering that everything current covers all platforms, I don't think that historical nicety is too important at this point!