Add pb/index.md documentation

hyp3rflow · hyp3rflow · commit 33d61cea0ba3 · 2022-04-04T13:29:35.000+09:00
diff --git a/docs/pb/index.md b/docs/pb/index.md
@@ -0,0 +1,4 @@
+The `pb` cli is Protobuf schema compiler like `protoc`.\
+`protoc` has native binary dependencies, but pb command is written in pure
+TypeScript, so it can be used comfortably in Node.js projects, etc., and can
+even easily be run in a web browser.
