add tools section

readme.md

@@ -58,6 +58,16 @@ cargo build --release
 
 - Configure any custom clients to connect to `ws://127.0.0.1:3030/websocket` for local testing or `wss://cards.doordesk.net/websocket` to use my server
 
+## Tools:
+
+There is a tool named socket_blaster used for stress testing the server.
+
+Run
+```sh
+cargo run -p socket_blaster -- -h
+```
+to see available options.
+
 ## TODO:
 
 - prevent zombie users after browser crash