add async functions descriptions

Author: alexeyraspopov

docs/README.md

@@ -9,9 +9,22 @@ Small library which leverages the power of modern JavaScript to provide seamless
 
 In the world full of APIs, we starting to forget the power of plain JavaScript and how essential patterns eliminate the need in providing new abstractions.
 
-The power of coroutines allows to write code in synchronous style and be able to pause it or partially postpone its execution. This essential idea brought us [Async Functions](https://github.com/tc39/ecmascript-asyncawait) which are already included in the language.
+The power of coroutines allows to write code in synchronous style and be able to pause it or partially postpone its execution. This essential idea brought us [Async Functions](https://github.com/tc39/ecmascript-asyncawait) which are already included in the language. Async functions allow us to get rid of complex Promises API and use plain JavaScript instructions.
+
+```javascript
+async function doSomethingComplex(data) {
+  try {
+    const response = await postData(data);
+    const status = await getStatus(response.headers.Location);
+    return status;
+  } catch (error) {
+    notify('Unable to perform the action', error);
+  }
+}
+```
+
+Since React allows as to treat the UI as a first-class citizen, we can mix both things for the sake of solving problems that are the same in React and in just JavaScript code.
 
-This project tends to use the simplicity of functional React components and the essential mechanism of coroutines to create stateful components with colocation.
 
 ## Install