Add devcontainer file

[james-otten]

To use this:

1. Install the best IDE (VS Code)
2. Install the Dev Containers extension: ms-vscode-remote.remote-containers
3. Open the repo folder in the container
4. In a different shell, start the other containers: docker compose up -d postgres pelias redis
5. In the VS Code terminal (where your project is opened) follow normal developer setup (no venv needed)

python src/manage.py makemigrations
python src/manage.py migrate
python src/manage.py createsuperuser
python src/manage.py runserver
python src/manage.py test meshapi meshapi_hooks
invoke lint
invoke format
...

[WillNilges]

Can you please add these instructions to the README? Ideallly before the other dev instructions where folks will see them.

[james-otten]

Can you please add these instructions to the README? Ideallly before the other dev instructions where folks will see them.

Hope this makes sense

[WillNilges]

Thanks!