Move the .NET implementation to own repository and remove Colore

[WolfspiritM]

We need to remove the .NET Implementation from this repository and create a new repository called "bca-core".

At the same time we need to rewrite part of the example to support chroma-core instead of Colore.

[WolfspiritM]

New repository: https://github.com/chroma-sdk/bca-core