docs: add shutdownAfterInactiveSeconds parameter to README

Co-authored-by: mpetazzoni <[email protected]>

Author: Copilot

README.md

@@ -108,6 +108,11 @@ The `Connection.connect()` function can take the following additional options:
   impacts from shared resources. You might need to adjust cluster size if slowdowns
   occur, which could affect overall cost.
 
+- `shutdownAfterInactiveSeconds`: a positive integer specifying the number of
+  seconds of inactivity before the SQL session is automatically shut down
+  (optional). This parameter allows for better resource management and cost
+  control by automatically terminating idle sessions.
+
 - `resultsFormat`: one of the `ResultsFormat` enum values;
   Arrow encoding is the default and most efficient format for
   receiving query results.