improve readme

Author: StarpTech

README.md

@@ -82,3 +82,14 @@ const datasource = new (class MoviesAPI extends HTTPDataSource {
 // cancel all running requests e.g when request is closed prematurely
 datasource.abort()
 ```
+
+## Hooks
+
+- `onCacheKeyCalculation` - Returns the cache key for request memoization.
+- `onRequestError` - Is executed only for request errors.
+- `beforeRequest` - Is executed before a request is executed.
+- `onResponse` - Is executed on a successful response.
+
+## Error handling
+
+The http client throws for unsuccessful responses. Every error is rethrown to the caller. You can use the `onRequestError` hook to log request errors.