Add Joshua Mo's article about OpenAPI in Rust to Step 4.3

4_backend/4_3_api/README.md

@@ -41,6 +41,7 @@ For more familiarity with [OpenAPI] and using it in [Rust], read through the fol
 - [Twilio Docs: Generate a Rust client for Twilio's API][121]
 - [Fabian Odenthal: Auto-Generating & Validating OpenAPI Docs in Rust: A Streamlined Approach with Utoipa and Schemathesis][123]
 - [Olly Dixon: Auto-generating API service using Rust, to TypeScript & Dart][124]
+- [Joshua Mo: Working with OpenAPI using Rust][125]
 
 
 
@@ -182,6 +183,7 @@ After completing everything above, you should be able to answer (and understand
 [122]: https://support.smartbear.com/swaggerhub/docs/tutorials/openapi-3-tutorial.html
 [123]: https://identeco.de/en/blog/generating_and_validating_openapi_docs_in_rust
 [124]: https://www.polydelic.com/media/autogenerating-a-rust-api-to-typescript-and-dart
+[125]: https://www.shuttle.rs/blog/2024/04/04/using-openapi-rust
 [200]: https://graphql.org/learn/queries
 [201]: https://graphql.org/learn/schema
 [202]: https://graphql.org/learn/introspection