chore: add readme about protobuf

proto/README.md

@@ -0,0 +1,17 @@
+# Guide
+
+## Prerequisites
+
+- Install [buf](https://docs.buf.build/installation)
+
+## Generate
+
+```sh
+buf generate
+```
+
+## Format
+
+```sh
+buf format -w
+```