Document usage with Vim

[pydanny]

Following the pattern set in the PyCharm setup, document using this library with Vim

• Needs to provide instructions for using dj-notebook with vim
• Needs to be a pull request for a new file in the docs folder, not an external article.
• Must not include any other content except for instructions on how to use dj-notebook with vim
• Direct copies of existing content will be rejected

Resources:

• Connector: https://github.com/jupyter-vim/jupyter-vim