add chisel notebook

[proppy]

It would be nice to have a chisel version of the notebooks that show how to connect chisel verilog codegen to the rest of the open source silicon toolchain.

@schoeberl pointed to https://mybinder.org/v2/gh/freechipsproject/chisel-bootcamp/master as a reference.

[schoeberl]

I would be happy to help out and make this notebook. However, I will have time later in August.