HACKTOBERFEST: Approximation of pi and plotting example

[RodolfoFerro]

Added Approximating pi script and an example script on hot to plot a function using matplotlib.

Approximating pi

This script is useful to show a way to approximate the value of pi using a Monte Carlo method. It is also optimized using the @jit (just-in-time) decorator from the numba library.

To see different approximations you just need to modify the argument passed to the main function.

python pi.py

Plotting a function

This script contains an example of plotting a function using matplotlib. Feel free to modify the value of y to obtain different functions that depend on x.

python plot_example.py

[RodolfoFerro]

Hey @Logan1x , I'll begin with some PRs uploading scripts. 😃 👍

[Logan1x]

Thanks @RodolfoFerro For help :)