Update README.md

[ExtremeKiller145]

I made it clearer what this project does by explicitly mentions it. I am not 100% sure that it works as I described since I didn't read the code, but that is how it seemed to work in practice.

[MalcolmMielle]

Thanks for the PR and helping with the package README.

I'm not sure what you meant by "only at its declaration."? What the package does is that it has a panel of color for variables and will give each individual variable the same color in the file. So if you have:

foo = 1
foon = foo + 1

def test(self, test: int) -> None:
    return test + 100

foo will have its own color (at line 1 and line 2), foon will have its own color, and test will have its own color, but only the argument test of the function test will be colorized (and also at line 5) and not the function name. So you could have, for example:

(red)foo = 1
(blue)foon = (red)foo + 1

def test(self, (green)test: int) -> None:
    return (green)test + 100

What part of the README/package are you trying to clarify :)? Maybe the section you added would be even better if a section on how to parameterize the colors was added to the README?