Proposal: django-phonenumber-field

# Project Proposal

## Project Details
[django-phonenumber-field](https://github.com/stefanfoulis/django-phonenumber-field/)

## Project Description
A Django library which interfaces with [python-phonenumbers](https://github.com/daviddrysdale/python-phonenumbers) to validate, pretty print and convert phone numbers. [python-phonenumbers](https://github.com/daviddrysdale/python-phonenumbers) is a port of Google's [libphonenumber](https://github.com/google/libphonenumber) library, which powers Android's phone number handling.

While @francoisfreitag is submitting the issue, you can see the project has long intended to join Jazzband with https://github.com/stefanfoulis/django-phonenumber-field/issues/224 and latest PR https://github.com/stefanfoulis/django-phonenumber-field/pull/536.

I emailed Stefan, who should confirm this proposal, coordinate to transfer the repository to Jazzband and add Jazzband as a maintainer on PyPI.

## Project Leads
- Stefan Foulis @stefanfoulis
- François Freitag @francoisfreitag

## Confirmation of Guidelines

Please confirm the following:

- [x] I am the project owner, or have permission from the project owner, to request a transfer.

- [x] This project is a [viable candidate](https://jazzband.co/about/guidelines#viability) for Jazzband.

- [x] This project fulfills the [documentation requirements](https://jazzband.co/about/guidelines#documentation): https://django-phonenumber-field.readthedocs.io/

- [x] This project is [tested](https://jazzband.co/about/guidelines#tests).

- [x] I am happy to adopt Jazzband's [code of conduct](https://jazzband.co/about/guidelines#conduct) in this project.

- [x] I am happy to include Jazzband's [contributing guidelines](https://jazzband.co/about/guidelines#contributing-guidelines) in this project.