update README.md

Author: maltsev-dev

README.md

@@ -13,3 +13,6 @@
 ![Tokio Version](https://img.shields.io/badge/tokio-1.28.0%20-green)
 ![reqwest Version](https://img.shields.io/badge/reqwest-0.11.17%20-green)
 ![serde Version](https://img.shields.io/badge/serde-1.0.160%20-green)
+
+
+# Call OpenAI models