docs: add tianlang book command.

README.md

@@ -1,7 +1,7 @@
 # ⏬ bookhunter
 
-Downloading books from [talebook](https://github.com/talebook/talebook), [www.sanqiu.mobi](https://www.sanqiu.mobi/) and
-Telegram Channels. This is a totally rewritten fork compared to
+Downloading books from [talebook](https://github.com/talebook/talebook), [www.sanqiu.mobi](https://www.sanqiu.mobi/)
+, [www.tianlangbooks.com](www.tianlangbooks.com) and Telegram Channels. This is a totally rewritten fork compared to
 its [original version](https://github.com/hellojukay/dl-talebook).
 
 ## 🚧 Development
@@ -38,6 +38,7 @@ by your running environment.
 * [Login Aliyundrive to get the refreshToken](#login-aliyundrive-to-get-the-refreshtoken)
 * [Register account in Talebook](#register-account-in-talebook)
 * [Download books from Talebook](#download-books-from-talebook)
+* [Download books from Tianlang](#download-books-from-tianlang)
 * [Download books from Sanqiu](#download-books-from-sanqiu)
 * [Download books from Telegram groups.](#download-books-from-telegram-groups)
 
@@ -96,6 +97,34 @@ Global Flags:
  --verbose Print all the logs for debugging
 ```
 
+### Download books from Tianlang
+
+```text
+Usage:
+ bookhunter tianlang [flags]
+
+Flags:
+ -d, --download string The book directory you want to use (default "/Users/Yufan/Developer/Go/bookstairs/bookhunter")
+ -e, --extract Extract the archive file for filtering
+ -f, --format strings The file formats you want to download (default [epub,azw3,mobi,pdf,zip])
+ -h, --help help for tianlang
+ -i, --initial int The book id you want to start download (default 1)
+ --ratelimit int The allowed requests per minutes (default 30)
+ --refreshToken string Refresh token for aliyun drive
+ -r, --rename Rename the book file by book id
+ --secretKey string The secret key for tianlang (default "359198")
+ --source string The source (aliyun, telecom, lanzou) to download book (default "telecom")
+ --telecomPassword string Telecom drive password
+ --telecomUsername string Telecom drive username
+ -t, --thread int The number of download thead (default 1)
+
+Global Flags:
+ -c, --config string The config path for bookhunter
+ --proxy string The request proxy
+ -a, --user-agent string The request user-agent (default "Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/13.0 Firefox/13.0")
+ --verbose Print all the logs for debugging
+```
+
 ### Download books from Sanqiu
 
 ```text