Added Implementation of NAND, OR ,XNOR and NOT gates in python (#7596)

* Added Implementation for XNOR gate

* Added Implementation for OR gate

* Added implementation of NAND gate

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* Added Implementation of NAND gate

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* Updated nand_gate.py

* updated xnor_gate.py after some changes

* Delete due to duplicate file

* Updated xnor_gate.py

* Added Implementation of NOT gate in python

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* fixed a typo error

* Updated to a new logic

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* Updated nand_gate.py file

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