Add a way to donate / support project

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Issue

For developer time writing features, tests, documentation, QA PRs and in the issue tracker, there should be financial support / donations for the time of the developers. Right now (as of this post) it is @finswimmer @abn @sdispater and @stephsamson

This project is too sophisticated and essential to not have funding for operating and maintaining it. Please add a GitHub sponsors, patreon, opencollective, etc. so maintainers can have expenses compensated for website/domain/operating CI/etc and time spent on project (issues, docs, tests, qa, writing features, etc)

Also please consider linking to the contribution options in the installers: get-poetry.py and the new install-poetry.py in 1.2+

The org should then try to see if larger companies can contribute if they depend on it - since there is an investment in using the tech, it's super important poetry operates work smoothly and the project doesn't grow stale due to too high of a workload / fatigue / etc on maintainers

Start by reviewing the donation and support request, then inspect get-poetry.py and install-poetry.py to understand where installer contribution links could be placed. The work is done when the project has an agreed support or donation option and the relevant installer entry points link to it.