Update README.md

README.md

@@ -1,4 +1,12 @@
-# jsonb
+# jsonb   [![Build Status]][actions] [![Latest Version]][crates.io] [![Crate Downloads]][crates.io]
+
+[build status]: https://img.shields.io/github/actions/workflow/status/datafuselabs/jsonb/rust.yml?branch=main
+[actions]: https://github.com/datafuselabs/jsonb/actions?query=branch%3Amain
+[latest version]: https://img.shields.io/crates/v/jsonb.svg
+[crates.io]: https://crates.io/crates/jsonb
+[crate downloads]: https://img.shields.io/crates/d/jsonb.svg
+
+
 
 `jsonb` is a jsonb implementation written in Rust. It provides a fast, lightweight, and easy-to-use API for working with jsonb data.
 
@@ -8,3 +16,20 @@
 - Easy to use API: `jsonb` provides a simple and intuitive API for working with jsonb data, making it easy to get started.
 - Safe and secure: `jsonb` is written in Rust, which provides memory safety and thread safety guarantees, making it a safe choice for handling sensitive data.
 - Flexible: `jsonb` supports a wide range of data types and can be used to store complex data structures.
+
+
+## JSONB value struct
+
+``` rust
+// JSONB value
+#[derive(Clone, PartialEq, Eq)]
+pub enum Value<'a> {
+    Null,
+    Bool(bool),
+    String(Cow<'a, str>),
+    Number(Number),
+    Array(Vec<Value<'a>>),
+    Object(Object<'a>),
+}
+```
+