[ENH] Softmax activation function added

[KowshikB03]

Fixes Issue #2593

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[hadifawaz1999]

Thank you for this but i left a comment on the corresponding issue on how this is not a bug

[MatthewMiddlehurst]

Hi, I agree with Ali here if these are the published defaults then I don't really want to change them unless there is a publication showing it is better.

@hadifawaz1999 a warning or documentation change should be fine though if you think this would produce better results in certain scenarios? If not or it's unknown, keep it as it is. Up to you really.