✨ add README to async chapter

exercises/24_async/README.md

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+# Async in Rust
+
+In modern software development, handling multiple operations at once is crucial for performance and responsiveness. Rust facilitates this through asynchronous programming, allowing your code to perform non-blocking operations efficiently. This chapter explores the key aspects of async programming in Rust.
+
+## Introduction to Async
+Discover the basics of asynchronous programming by writing your first async function. Understand how futures work and the differences between sync and async code.
+
+## Using Async and Await
+Convert a traditional synchronous function to use async/await syntax. This exercise helps illustrate the benefits and usage of Rust’s async constructs.
+
+## Understanding Task Execution
+Learn about executing multiple tasks concurrently without blocking. This exercise focuses on how Rust handles async task execution under the hood.
+
+## Shared State in Async Code
+Tackle the challenges of managing shared state in an asynchronous context. Use synchronization tools like Mutexes to safely manage state across concurrent tasks.
+
+## Error Handling in Async
+Navigate the complexities of error handling in async code. Understand how errors propagate differently in async workflows and how to handle them effectively.
+
+## Further Information
+- [Learn more about async programming in Rust](https://doc.rust-lang.org/book/ch16-00-concurrency.html)
+- [Deep dive into handling concurrency](https://doc.rust-lang.org/book/ch16-02-message-passing.html)
+- [Advanced async patterns](https://tokio.rs/tokio/tutorial)