move top-level modules into a real package

chromy/handlers/create_collection.py

@@ -0,0 +1,9 @@
+from argparse import Namespace
+
+from chromy.chroma_functions import create_collection
+
+
+def handle_create_collection(args: Namespace) -> int:
+    collection_name = create_collection(args.collection)
+    print(f"Created collection '{collection_name}'.")
+    return 0