Add the forward propagation of Softmax

[coveralls]

Pull Request Test Coverage Report for Build 809

• 29 of 37 (78.38%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.9%) to 86.552%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mobula/glue/mx.py	0	1	0.0%
opzoo/Softmax/Softmax.py	1	8	12.5%
<!--	Total:	29	37	78.38%	-->

Files with Coverage Reduction	New Missed Lines	%
mobula/glue/mx.py	1	74.6%
<!--	Total:	1		-->

Totals
Change from base Build 806:	0.9%
Covered Lines:	1757
Relevant Lines:	2030

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💛 - Coveralls