fix: Add manually __init__.py

diagrams/snowflake/__init__.py

@@ -0,0 +1,12 @@
+"""
+Saas provides a set of general saas services.
+"""
+
+from diagrams import Node
+
+
+class _Snowflake(Node):
+    _provider = "snowflake"
+    _icon_dir = "resources/snowflake"
+
+    fontcolor = "#ffffff"