fix: add license footer

clflushopt · clflushopt · commit 32eb00781242 · 2025-05-24T15:10:18.000-04:00
diff --git a/README.md b/README.md
@@ -66,4 +66,8 @@ async fn main() -> Result<()> {
     df.show().await?;
     Ok(())
 }
-```
+```
+
+## License
+
+The project is licensed under the [APACHE 2.0](LICENSE) license.
