Add metadata.csv with comma separator and file_name

metadata.csv

@@ -1,3 +1,3 @@
-file_name	wav_filesize	transcript	quran_id	reciter	bitrate	split	subset
-data/audio/Imam/Abdullah_Basfar/001002_Abdullah_Basfar_64kbps.wav	183946	ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ	001002	Abdullah_Basfar	64kbps	train	Imam
-data/audio/Imam/Abu_Bakr_Ash-Shaatree/001002_Abu_Bakr_Ash-Shaatree_64kbps.wav	163884	ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ	001002	Abu_Bakr_Ash-Shaatree	64kbps	train	Imam
+file_name,wav_filesize,transcript,quran_id,reciter,bitrate,split,subset
+data/audio/Imam/Abdullah_Basfar/001002_Abdullah_Basfar_64kbps.wav,183946,ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ,001002,Abdullah_Basfar,64kbps,train,Imam
+data/audio/Imam/Abu_Bakr_Ash-Shaatree/001002_Abu_Bakr_Ash-Shaatree_64kbps.wav,163884,ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ,001002,Abu_Bakr_Ash-Shaatree,64kbps,train,Imam