feat: add copyright notices

content/Chinesisch-lernen-fuer-die-Sinologie,-Band-1/.apkg-spec.yaml

@@ -25,4 +25,10 @@ content:
     - Schreiben anlegen
     - Zhuyin
     - Lesen (繁體字) anlegen
+    fields_static:
+        Credits: <div notice-file="CLFDS_NOTICE"></div>
+
     tags: []
+
+resource_paths:
+- CLFDS_NOTICE.js