✨(project) first proof of concept based of Joanie

Used https://github.com/openfun/joanie as boilerplate, ran a few
transformations with ChapGPT  and adapted models and endpoints to
fit to my current vision of the project.

UPGRADE.md

@@ -0,0 +1,17 @@
+# Upgrade
+
+All instructions to upgrade this project from one release to the next will be
+documented in this file. Upgrades must be run sequentially, meaning you should
+not skip minor/major releases while upgrading (fix releases can be skipped).
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+For most upgrades, you just need to run the django migrations with
+the following command inside your docker container:
+
+`python manage.py migrate`
+
+(Note : in your development environment, you can `make migrate`.)
+
+## [Unreleased]