added asset to read agency_list.csv and add it to table in gtfs.duckdb

user_code/gtfs/definitions.py

@@ -0,0 +1,12 @@
+from dagster import Definitions
+from dagster_duckdb import DuckDBResource
+from assets import agency_list
+
+defs = Definitions(
+    assets=[agency_list],
+    resources={
+        "duckdb": DuckDBResource(
+            database="data/gtfs/gtfs.duckdb"
+        )
+    }
+)