Python: Set up test for Django REST framework

this is just pure Django project for now, (and very much a copy of the
one in `django-v2-v3`), to make it easier to see the changes needed to
set up Django REST framework.

Author: RasmusWL

python/ql/test/library-tests/frameworks/rest_framework/README.md

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+See README for `django-v2-v3` which described how the project was set up and how to run the development server.

python/ql/test/library-tests/frameworks/rest_framework/manage.py

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+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'testproj.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

python/ql/test/library-tests/frameworks/rest_framework/testapp/__init__.py

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+from django.contrib import admin
+
+# Register your models here.

python/ql/test/library-tests/frameworks/rest_framework/testapp/admin.py

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+from django.apps import AppConfig
+
+
+class TestappConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'testapp'

python/ql/test/library-tests/frameworks/rest_framework/testapp/apps.py

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+from django.db import models
+
+# Create your models here.

python/ql/test/library-tests/frameworks/rest_framework/testapp/migrations/__init__.py

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+from django.test import TestCase
+
+# Create your tests here.

python/ql/test/library-tests/frameworks/rest_framework/testapp/models.py

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+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path("foo/", views.foo),  # $routeSetup="foo/"
+]

python/ql/test/library-tests/frameworks/rest_framework/testapp/tests.py

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+from django.http import HttpResponse, HttpRequest
+
+def foo(request: HttpRequest):
+    return HttpResponse("foo")