docs: update README.md

README.md

@@ -84,7 +84,7 @@ const result = await XenoCanto.search(query, options);
 
 #### Multiple Pages
 
-For results that have multiple pages, you can pass the `page` parameter to the `search` method
+For results that have multiple pages, you can pass the `page` parameter to the `search` method:
 
 ```ts
 // Create query and options
@@ -142,6 +142,14 @@ const additionalOptions = {
 const result = await XenoCanto.search(query, options, 1, additionalOptions);
 ```
 
+#### Custom Data Fetching
+
+If you wish to implement your own data retrieval methods instead of using the Fetch API, you can utilize the `convertJsonToXCResponse` method by passing the JSON response:
+
+```ts
+const xcResponse = XenoCanto.convertJsonToXCResponse(json);
+```
+
 ## Limitation
 
 Due to the API limitation, only English queries are supported, and the query should based on scientific or common names. You may refer to the [IOC World Bird List - Multilingual Version](https://www.worldbirdnames.org/new/ioc-lists/master-list-2/) for looking up and mapping the corresponding names.