docs: 📚 update README

Author: spike014

README.md

@@ -1,4 +1,48 @@
 # task_bot
-A robot that sends you a daily task and motivates you to cultivate a daily habit, power by `GitHub Actions`.
+A robot that sends a daily task and motivates to cultivate a daily habit, power by `GitHub Actions`.
 
+[中文](./README_ZH.md)
 
+## How it works
+
+1. config daily task in `daily.toml`
+
+```toml
+[task.reading]
+describe = "Today's review of an old book is %v. Enjoy reading for fun!"
+tasks = [
+    "《animal farm》",
+    "《The Minimalist Entrepreneur》",
+    "《Lemo》",
+]
+```
+
+2. add email config to Actions secrets
+
+Go to repository page -> `Settings` -> `Security` -- `Secrets and variables` -> `Actions` -> `New repository secret`
+
+| Name         | Secret(example)   |
+| :----------- | :---------------- |
+| EMAIL_SERVER | smtp.mail.com:587 |
+| EMAIL_USER   | who_send_task     |
+| EMAIL_PASS   | sender_password   |
+| EMAIL_FROM   | [email protected]   |
+| EMAIL_TO     | [email protected]  |
+
+3. schedule task in `send_task.yml`
+
+```yml
+on:
+  schedule:
+    - cron: '* 2 * * *' # send you email with task detail at 2:00 AM UTC every day
+```
+
+more: [cron config](https://en.wikipedia.org/wiki/Cron)
+
+## One more thing
+
+Tell me with an issue if you want more feature about this project.
+
+## License
+
+MIT

README_ZH.md

@@ -0,0 +1,49 @@
+# task_bot
+
+一个发送日常任务，帮助养成日常习惯的机器人，由 `GitHub Actions` 驱动。
+
+[English](./README.md)
+
+## 工作原理
+
+1. 在 `daily.toml` 配置日常任务
+
+```toml
+[task.reading]
+describe = "今天的回顾旧书是 %v, 享受阅读的乐趣吧！"
+tasks = [
+     "《这些人那些事》",
+     "《The Minimalist Entrepreneur》",
+     "《侠隐》",
+]
+```
+
+2. 把邮件配置添加到 `Actions secrets` 
+
+去仓库页面 -> `Settings` -> `Security` -- `Secrets and variables` -> `Actions` -> `New repository secret`
+
+| Name         | Secret(示例)   |
+| :----------- | :---------------- |
+| EMAIL_SERVER | smtp.mail.com:587 |
+| EMAIL_USER   | who_send_task     |
+| EMAIL_PASS   | sender_password   |
+| EMAIL_FROM   | [email protected]   |
+| EMAIL_TO     | [email protected]  |
+
+3. 在 `send_task.yml` 编排任务时间
+
+```yml
+on:
+  schedule:
+    - cron: '* 2 * * *' # 每天 UTC 时间早上两点发送日常任务细节的邮件给你
+```
+
+更多配置方法: [cron config](https://en.wikipedia.org/wiki/Cron)
+
+## 还有一件事
+
+如果你想要更多新功能，开一个 issue 告诉我。
+
+## 许可证
+
+MIT