update README

Author: nociza

README.md

@@ -91,6 +91,9 @@ cargo run --example user_stop_protocol_operator <address> <user_jwt> <instance_i
 ```
 cargo run --example user_wait_task <address> <user_jwt> <target_user_id>
 ```
+```
+cargo run --example storage_macro_chunk <address> <user_jwt> <payload_size>
+```
 
 ### Protocol
 ```