Add more analysis functions

[AlexandreHiroyuki]

Inspired by: https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.describe.html

[Nasir-Hussain-Datascientist]

Hey Alex,
you are missing some functions that are,
pandas.DataFrame.mad: It Computes the Mean Absolute Deviation along the axis.
pandas.DataFrame.memory: It Calculates the memory usage of each DataFrame column.
pandas.DataFrame.sizeof:It Returns the memory usage of the DataFrame.

[AlexandreHiroyuki]

Hey @nasir-hussain-swat, thanks for the suggestions!

[Nasir-Hussain-Datascientist]

@AlexandreHiroyuki you are welcome, any tasks regarding python especially Datascience, i'll be happy to do.