doc: update CONTRIBUTING.md with new build.

Author: andycall

.github/CONTRIBUTING.md

@@ -22,41 +22,33 @@ git submodule update --init --recursive
 $ npm install
 ```
 
-## Building bridge
+## Prepare
 
-> Debug is the default build type, if you want to have a release build, please add `:release` after your command.
->
-> Exp: Execute `npm run build:bridge:macos:release` to build a release bridge for the macOS platform.
+**Windows, Linux, Android**
 
-**Windows**
+The current C/C++ code build process has been integrated into Flutter's compilation and build pipeline for Windows, Linux, and Android.
 
-```shell
-$ npm run build:bridge:windows:release
-```
-
-**macOS**
+Run the following script to generate C/C++ binding code using the code generator:
 
 ```shell
-$ npm run build:bridge:macos:release
+npm run generate_binding_code
 ```
 
-**linux**
+---
 
-```shell
-$ npm run build:bridge:linux:release
-```
+**iOS and macOS**
 
-**iOS**
+> The default build type is Debug. To create a release build, add `:release` to your command.  
+>  
+> Example: Execute `npm run build:bridge:macos:release` to build a release bridge for macOS.
 
 ```shell
-$ npm run build:bridge:ios:release
+$ npm run build:bridge:ios:release    # iOS
+$ npm run build:bridge:macos:release  # macOS
 ```
 
-**Android**
+--- 
 
-```shell
-$ npm run build:bridge:android:release
-```
 
 ### Run Example
 

package.json

@@ -18,6 +18,7 @@
     "build:bridge:all": "node scripts/prepare_webf_release_binary",
     "build:bridge:all:release": "WEBF_BUILD=Release node scripts/prepare_webf_release_binary",
     "build_bridge:all:profile": "ENABLE_PROFILE=true npm run build:bridge:all:release",
+    "generate_binding_code": "node scripts/generate_binding_code",
     "build:clean": "node scripts/clean.js",
     "pretest": "npm install && node scripts/build_darwin_dylib",
     "posttest": "npm run lint",

scripts/generate_binding_code.js

@@ -8,6 +8,7 @@ require('./tasks');
 
 // Run tasks
 series(
+  'compile-polyfill',
   'generate-bindings-code',
 )((err) => {
   if (err) {