Update data field

README.md

@@ -111,6 +111,7 @@ Each data point contains the following fields:
 - **district** (`string`): The district (Amphoe) where the speaker resides.
 - **province** (`string`): The province (Changwat) where the speaker resides.
 - **age** (`int`): The age of the speaker.
+- **gender** (`string`): The gender of the speaker. Values include "m" (male), "f" (female), and "x" (not specified).
 - **question_id** (`string`): The ID of the prompt question asked to the speaker.
 - **question** (`string`): The text of the question asked to the speaker.
 - **duration** (`float`): The duration of the audio clip in seconds.