Publish flutter packages for Android (#1074)

flutter/notes2.md

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+# Some use commands while learning flutter/dart
+
+## macOS
+
+1. Build required libraries
+
+```bash
+git clone https://github.com/k2-fsa/sherpa-onnx
+cd sherpa-onnx
+mkdir build
+cd build
+
+cmake -DCMAKE_INSTALL_PREFIX=./install -DBUILD_SHARED_LIBS=ON -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" ..
+make install
+cd ../sherpa-onnx/flutter/
+cp -v  ../../build/install/lib/lib* ./macos/
+```
+
+2. Test for speaker identification
+
+```bash
+cd sherpa-onnx/sherpa-onnx/flutter/example
+mkdir assets
+```
+
+
+## Useful commands
+```
+flutter pub publish --dry-run
+flutter run -d macos
+flutter run -d linux
+flutter run -d windows
+
+flutter build macos
+
+flutter run --release -d macos
+
+# add platform to an existing project
+flutter create --platforms=windows,macos,linux .
+
+dart analyze
+
+FLUTTER_XCODE_ARCHS=arm64
+FLUTTER_XCODE_ARCHS=x86_64
+```
+
+## Examples
+
+  - https://dart.dev/tools/pub/automated-publishing
+
+     Use GitHub actions to publish
+
+  - https://dart.dev/tools/pub/pubspec
+
+     It describes the format of ./pubspec.yaml
+
+  - https://github.com/folksable/blurhash_ffi/
+
+      It supports ios, android, linux, macos, and windows.
+
+ - https://github.com/alexmercerind/dart_vlc
+ - https://github.com/dart-lang/native/tree/main/pkgs/jni