Split descriptions for Axis data set

[UntotaufUrlaub]

Dear Team,
thank you very much for the huge effort of this work!
Could you please also add a description of the splits used in the Axis data set ("test", "valid1", "valid2") into the Readme, as already provided for the "Comparisons".
I would like to know this to avoid any issues with information leakage between sets when combining the data set and model with other datasets & models trained on other data sets / data set combinations.

with kind regards.