Update README.md

Add links to vscode settings and helpful test command

Author: mihow

README.md

@@ -24,7 +24,7 @@ pip install pre-commit  # Install pre-commit system-wide
 pre-commit install  # Install the hook for our project
 ```
 
-If using VS Code, install the formatting extensions that are automatically suggested for the project (e.g. black). Format-on-save should be turned on by default from the project's vscode settings file.
+If using VS Code, install the [formatting extensions](.vscode/extensions.json) that are automatically suggested for the project (e.g. black). Format-on-save should be turned on by default from the project's [vscode settings file](.vscode/settings.json).
 
 
 ### Frontend
@@ -103,6 +103,12 @@ docker compose run --rm django python manage.py test
 docker compose run --rm django python manage.py test -k pattern
 ```
 
+##### Run tests and drop into interactive shell on failure
+
+```bash
+docker compose run --rm django python manage.py test -k pattern --failfast --pdb
+```
+
 ##### Launch the Django shell:
 
     docker-compose exec django python manage.py shell