Update README.md

Author: lmangani

README.md

@@ -2,7 +2,7 @@
   <img src="https://avatars.githubusercontent.com/u/132536224" width=130 />
 </a>
 
-[![chDB-node](https://github.com/metrico/chdb-bun/actions/workflows/bun-test.yml/badge.svg)](https://github.com/metrico/chdb-bun/actions/workflows/bun-test.yml)
+[![chDB-bun](https://github.com/metrico/chdb-bun/actions/workflows/bun-test.yml/badge.svg)](https://github.com/metrico/chdb-bun/actions/workflows/bun-test.yml)
 
 # chdb-bun <img src="https://user-images.githubusercontent.com/1423657/236928733-43e4f74e-5cff-4b3f-8bb7-20df58e10829.png" height=20 />
 Experimental [chDB](https://github.com/auxten/chdb) FFI bindings for [bun.sh](https://bun.sh)
@@ -18,18 +18,44 @@ bun install chdb-bun
 ```
 
 #### Usage
+
+#### Query Constructor
 ```js
-import { db, chdb } from 'chdb-bun';
+import { db } from 'chdb-bun';
 
 const conn = new db('CSV')
-var result;
+console.log(conn.query("SELECT version()"));
+```
 
-// Test query
-result = conn.query("SELECT version()");
-console.log(result)
+#### Query _(query, *format)_
+```javascript
+import { db } from 'chdb-bun';
+const conn = new db('CSV')
+
+// Query (ephemeral)
+var result = conn.query("SELECT version()", "CSV");
+console.log(result) // 23.10.1.1
+```
+
+#### Session _(query, *format, *path)_
+```javascript
+import { db } from 'chdb-bun';
+const conn = new db('CSV', '/tmp')
 
-// Test session
+// Query Session (persistent)
 conn.session("CREATE FUNCTION IF NOT EXISTS hello AS () -> 'chDB'");
 result = conn.session("SELECT hello()", "CSV");
 console.log(result)
 ```
+
+> ⚠️ Sessions persist table data to disk. You can specify `path` to implement auto-cleanup strategies:
+```javascript
+const temperment = require("temperment");
+const tmp = temperment.directory();
+conn.session("CREATE FUNCTION IF NOT EXISTS hello AS () -> 'chDB'", "CSV", tmp)
+var result =  = chdb.Session("SELECT hello();")
+console.log(result) // chDB
+tmp.cleanup.sync();
+```
+
+<br>