finding different diffraction parameters

[Void-py]

Describe your change:

**diffraction.py is a module used to calculate various parameters of single slit and double slit diffraction patterns such as >>> checking if a given wavelength ,diffraction angle and slit width corresponds to the minimum intensity observed in the diffraction pattern. >>> checking if a given wavelength ,diffraction angle and slit width corresponds to the minimum intensity observed in the diffraction pattern >>> calculating the intensity of a fringe observed in a single slit diffraction pattern based on the slit width ,diffraction angle and wavelength. >>> calculating the intensity of a fringe observed in a double slit diffraction pattern based on the path difference and the central maximum or the maximum intensity observed, **

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