Add ppsetuptools to packaging section

[TheCleric]

I've developed a package that I think would be a good addition for this list: ppsetuptools. It is a straightforward drop-in replacement for setuptools that reads from a pyproject.toml file instead of having project metadata defined in a setup.py script.

Resource description

ppsetuptools is a drop-in replacement for python setuptools that uses pyproject.toml files for package metadata instead of the setup.py

By submitting this pull request I confirm I've read and complied with the below requirements

• I have read and understood the Contribution Guidelines
• I am making an individual pull request for each entry
• I have added a useful title to the commit
• I have added a useful title to this PR
• I have added the new entry in alphabetical order
• I have used the following format:

  - [Resource Title](link) - Resource short Description (2 lines or less in total)
  

• The new entry meets one of these categories:
  • Is configured via its own tool sub-table in the pyproject.toml file (i.e., [tool.xxx])
  • Is a project template using the pyproject.toml file
  • Is an article about the pyproject.toml file
  • Is a link to a project discussion about pyproject.toml support

[carlosperate]

Thank you for the contribution @TheCleric!
This project is a brand new, let's wait a bit before consideration for the list.