Add known limitations sections in the readme

README.md

@@ -16,6 +16,13 @@ vsce package
 
 Output is a `.vsix` file that can be installed in VS code.
 
+## Known limitations
+
+- This driver only sends one query at a time, including queries used for the auto-complete feature.
+- Queries cannot be canceled once started. There is however a configurable query timeout in the connection settings.
+- There is no auto-complete support for schemas.
+- The support for sending multiple queries at once (separated by `;`) is experimental.
+
 ## References
 - Creating a new SQLTools driver: https://vscode-sqltools.mteixeira.dev/contributing/support-new-drivers
 - Exasol WebSocket API and Javascript implementation: https://github.com/exasol/websocket-api