Add information required to pip install

[danielolsen]

:rocket:

• [ ] Is your feature request essential for your project?

Describe the workflow you want to enable

I wish I could pip install . and have it work. Currently:

$ pip install .
ERROR: Directory '.' is not installable. Neither 'setup.py' nor 'pyproject.toml' found.
WARNING: You are using pip version 21.0.1; however, version 21.1.2 is available.
You should consider upgrading via the 'c:\python38\python.exe -m pip install --upgrade pip' command.

Describe your proposed implementation

Add a setup.py file or a pyproject.toml file.