add folder

nostr/subscription.py

@@ -0,0 +1,12 @@
+from .filter import Filters
+
+class Subscription:
+    def __init__(self, id: str, filters: Filters=None) -> None:
+        self.id = id
+        self.filters = filters
+
+    def to_json_object(self):
+        return { 
+            "id": self.id, 
+            "filters": self.filters.to_json_array() 
+        }