add kontor-blacksheep and kontor-piccolo as blueprints for new app

kontor-piccolo/conftest.py

@@ -0,0 +1,17 @@
+import os
+import sys
+
+from piccolo.utils.warnings import colored_warning
+
+
+def pytest_configure(*args):
+    if os.environ.get("PICCOLO_TEST_RUNNER") != "True":
+        colored_warning(
+            "\n\n"
+            "We recommend running Piccolo tests using the "
+            "`piccolo tester run` command, which wraps Pytest, and makes "
+            "sure the test database is being used. "
+            "To stop this warning, modify conftest.py."
+            "\n\n"
+        )
+        sys.exit(1)