Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -28,20 +28,20 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: saree
-          1: kamel
-          2: mutakareb
-          3: mutadarak
-          4: munsareh
-          5: madeed
-          6: mujtath
-          7: ramal
-          8: baseet
-          9: khafeef
-          10: taweel
-          11: wafer
-          12: hazaj
-          13: rajaz
+          '0': saree
+          '1': kamel
+          '2': mutakareb
+          '3': mutadarak
+          '4': munsareh
+          '5': madeed
+          '6': mujtath
+          '7': ramal
+          '8': baseet
+          '9': khafeef
+          '10': taweel
+          '11': wafer
+          '12': hazaj
+          '13': rajaz
   config_name: plain_text
   splits:
   - name: train