No examples in the documentation

[ufechner7]

If you do not know the DSP functions from Matlab or SciPy already this library is nearly unusable because no examples are provided.

[martinholters]

Help on improving the documentation is always welcome.

[ufechner7]

You can find some examples at https://github.com/aenarete/DiscreteFilters.jl/tree/main/examples