make bench

packages/protobuf-bench/README.md

@@ -0,0 +1,14 @@
+# Code size comparison
+
+This is a simple code size comparison between protobuf-es and google-protobuf.
+
+We are generating code for the module [buf.build/bufbuild/buf](https://buf.build/bufbuild/buf)
+once with `protoc-gen-js` from [github.com/protocolbuffers/protobuf-javascript](https://github.com/protocolbuffers/protobuf-javascript), 
+once with `protoc-gen-es` from Protobuf-ES. Then we bundle a [snippet of code](./src) 
+with [esbuild](https://esbuild.github.io/), minify the bundle, and compress it like a web 
+server would usually do.
+
+| code generator      | bundle size             | minified               | compressed         |
+|---------------------|------------------------:|-----------------------:|-------------------:|
+| protobuf-es         | 89,648 b      | 37,862 b | 9,699 b |
+| protobuf-javascript | 394,384 b  | 288,653 b | 45,140 b |