Update README.md

README.md

@@ -4,6 +4,10 @@ This crate provides a `Valid` type that can be used in combination with `Json`,
 
 ## Usage
 
+```shell
+cargo add axum-valid
+```
+
 ```rust
 use validator::Validate;
 use serde::Deserialize;
@@ -29,4 +33,4 @@ pub async fn get_page_by_json(
     assert!((1..=50).contains(&pager.page_size));
     assert!((1..).contains(&pager.page_no));
 }
-```
+```