add a simple bash script to automate the setup of the project

setup.sh

@@ -0,0 +1,9 @@
+rm inventory/migrations/*.py
+source bin/activate
+pip3 install -r requirements.txt
+python3 manage.py makemigrations inventory
+python3 manage.py migrate
+echo "from django.contrib.auth.models import User; \
+      User.objects.filter(email='admin@example.com').delete(); \
+      User.objects.create_superuser('admin', 'admin@example.com', 'password')" |
+      python3 manage.py shell