What does this PR do?

Provides pip configuration according to #45.

Install the kernel locally

pip install --user .

This will install the python package that contains only __init__.py. The kernel will be placed into shared jupyter directory making the kernel visible to jupyter.

The kernel can be easy uninstalled:

pip uninstall jjava

Install the kernel from repository

This PR will also make it possible to install the kernel by cloning JJava repository:

pip install --user git+https://github.com/dflib/jjava.git