Introduction of musicpy algorithms module

There are some music analysis algorithms I am developing based on musicpy, you can find them in the algorithms module in musicpy package.

The algorithms module is imported in musicpy as alg as default, so you can use the musicpy algorithms module like:

import musicpy as mp

chord_type = mp.alg.detect(chord('C,E,G,B'))
>>> print(chord_type)
Cmaj7
# detect function is one of the music analysis algorithms in the algorithms module

Most of the music analysis algorithms in the algorithms module are still under development, and I will try to document some of the relatively developed algorithms in my spare time.