add NIP-22 created_at limits to Server-Limitations

11.md

@@ -80,6 +80,8 @@ are rejected or fail immediately.
         "min_pow_difficulty": 30,
         "auth_required": true,
         "payment_required": true,
+        "created_at_lower_limit":31536000,
+        "created_at_upper_limit":3,
   }
 ...
 }
@@ -123,6 +125,10 @@ Even if set to False, authentication may be required for specific actions.
 
 - `payment_required`: this relay requires payment before a new connection may perform any action.
 
+- `created_at_lower_limit`: 'created_at' lower limit as defined in [NIP-22](22.md)
+
+- `created_at_upper_limit`: 'created_at' upper limit as defined in [NIP-22](22.md)
+
 ### Event Retention ###
 
 There may be a cost associated with storing data forever, so relays