Update README.md

Author: adeebshihadeh

README.md

@@ -57,6 +57,7 @@ pre-commit run --all-files       # run the linter
 * [`opendbc/dbc/`](opendbc/dbc/) is a repository of [DBC](https://en.wikipedia.org/wiki/CAN_bus#DBC) files
 * [`opendbc/can/`](opendbc/can/) is a library for parsing and building CAN messages from DBC files
 * [`opendbc/car/`](opendbc/car/) is a high-level library for interfacing with cars using Python
+* [`opendbc/safety/`](opendbc/safety/) is the functional safety for all the cars supported by `opendbc/car/`
 
 ## How to Port a Car