Add english translation

First off all, i appreciate @alibaba for creating such an amazing plugin.
But the problem is i'm facing so much difficulty while understanding it because it's all written in chinease.
Wouldn't it be great if english translation is added also then everyone will be able to understand and learn as knowledge should transfer to everyone who likes.
Thanks

The issue does not identify any files, documentation pages, or tests, so first inventory the Chinese-language content in the FlutterBoost repository and determine what is in scope for translation. Done means the agreed in-scope content has an English translation, with the translated locations clearly documented for review.

Written by the indexing model from the issue text.