Fix readme

Author: auxten

README.md

@@ -5,21 +5,44 @@
 # chdb-node
 [chDB](https://github.com/chdb-io/chdb) nodejs bindings for fun and hacking.
 
-### Status
+### Install
+```bash
+npm i chdb
+```
+
+### Usage
+
+```javascript
+const { query, Session } = require("chdb");
+
+var ret;
+
+// Test standalone query
+ret = query("SELECT version(), 'Hello chDB', chdb()", "CSV");
+console.log("Standalone Query Result:", ret);
+
+// Test session query
+// Create a new session instance
+const session = new Session("./chdb-node-tmp");
+ret = session.query("SELECT 123", "CSV")
+console.log("Session Query Result:", ret);
+ret = session.query("CREATE DATABASE IF NOT EXISTS testdb;" +
+    "CREATE TABLE IF NOT EXISTS testdb.testtable (id UInt32) ENGINE = MergeTree() ORDER BY id;");
+
+session.query("USE testdb; INSERT INTO testtable VALUES (1), (2), (3);")
 
-- Experimental bindings
-- Requires [`libchdb`](https://github.com/chdb-io/chdb) on the system
+ret = session.query("SELECT * FROM testtable;")
+console.log("Session Query Result:", ret);
 
-### Build
+// Clean up the session
+session.cleanup();
+
+```
+
+#### Build from source
 
 ```bash
 npm run libchdb
 npm install
 npm run test
 ```
-
-### Examples
-
-See [example.js](example.js).
-
-