C# bindings have mangled documentation

[kaesaecracker]

C# uses XML tags to format the docs.

There are two main options here:

1. write all the C# docs manually
2. build / use a converter

While (1) would result in the best quality docs, the duplicate effort would probably mean lower coverage. (2) would be preferred.

[kaesaecracker]

with #20, the binding will not have any documentation at all :o