Add a choice

README.md

@@ -8,3 +8,18 @@ python -m venv venv
 source venv/bin/activate
 pip install -r requirements.txt
 ```
+# Usage
+## Termux
+```shell
+sudo python main.py -r
+# Only export as txt file
+sudo python main.py --type=txt -r
+# Only export as epub file
+sudo python main.py --type=epub -r
+# Export all supported type
+sudo python main.py --type=epub,txt -r
+# Export single chapter with chapter id
+sudo python main.py ec -C <chapterid>
+# Export book with book id
+sudo python main.py eb -B <bookid>
+```