Add reasonings for rules in documentation

[LKajan]

Expected behaviour
I want it to be more clear what each rule does, why it exists and how to fix it.
Just like Ruff does for each rule. see https://docs.astral.sh/ruff/rules/is-literal/#why-is-this-bad

Current behaviour
We kind of have the what part and examples but are certainly missing the why.

Additional context
Ruff has for each of its rules: What it does, Why is this bad?, Example, References

[Joonalai]

Is it enough to improve the documentation in README.md?

[LKajan]

That should be enough for now.