Integrate black into our project

[theSage21]

Our project now has some logic code (like the ranking function). Since these functions/computations can be written over multiple lines, code formatting becomes an issue. Different people have different styles of writing the same code.

To make collaboration easier, we don't leave it up to the programmer to select a style. We enforce a style using Black.

To solve this issue, go through the README of the Black project and set it up with the git pre commit hook method as mentioned in this part of the README

[rishabhKalakoti]

#94 : integrated black. (closed)
#95 : installed pre-commit, black