Add new methods.

README.md

@@ -10,9 +10,15 @@ composer require elvishp2006/carbon-field-rest-api-select
 
 ## Methods
 
-### set_endpoint()
+```set_endpoint```
 
 ```php
 ...
 ->set_endpoint( rest_url( 'wp/v2/posts' ) )
 ```
+
+```set_endpoint_label_path``` | default: ```title.rendered```
+
+```set_endpoint_value_path``` | default: ```id```
+
+```set_endpoint_search_param``` | default: ```search```