chore: Update CONTRIBUTING

Signed-off-by: Caijinglong <cjl_spy@163.com>

CONTRIBUTING.md

@@ -43,3 +43,20 @@ Please don't change CHANGELOG manually.
 All changes will read from the git commit log and automatically generate the CHANGELOG.
 
 Admins can use `melos version` to generate when before release.
+
+We need add type for the git commit message, like `feat: provide a new feature`.
+
+The type can be `feat`, `fix`, `docs`, `style`, `refactor`, `perf`, `test`, `chore`, `revert`.
+
+See [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) for more information.
+
+Also see it in [angular](https://github.com/angular/angular/blob/22b96b9/CONTRIBUTING.md#type).
+
+## Publish packages to pub.dev for admins
+
+Admins can use `melos version` to generate the version and publish it.
+
+1. Run `melos version` to generate the version. Or use `melos version --yes` to skip the version prompt.
+2. Publish, have two ways:
+   1. Run `melos publish` to publish the packages.
+   2. Create a new release in GitHub, the GitHub Action will publish the packages.