update readme

Author: yggverse

README.md

@@ -132,13 +132,23 @@ assert_eq!("Item".to_source(), "* Item")
 
 #### Quote
 
+##### Struct
+
 ``` rust
 match Quote::from("> Quote") {
     Some(quote) => assert_eq!(quote.value, "Quote"),
     None => assert!(false),
 }
 ```
 
+##### Trait
+
+``` rust
+use ggemtext::line::quote::Gemtext;
+assert_eq!("> Quote".as_value(), Some("Quote"))
+assert_eq!("Quote".to_source(), "> Quote")
+```
+
 ## Integrations
 
 * [Yoda](https://github.com/YGGverse/Yoda) - Browser for Gemini Protocol