Update README.md

Update with more explanation.

README.md

@@ -10,11 +10,21 @@ This model was converted to MLX format from [`openai-whisper-tiny`]().
 pip install mlx-whisper
 ```
 
+Write a python script, `example.py`, as the following
 ```python
 import mlx_whisper
 
 result = mlx_whisper.transcribe(
-    "FILE_NAME",
-    path_or_hf_repo=Kimang18/whisper-tiny-khmer-mlx,
+    SPEECH_FILE_NAME,
+    path_or_hf_repo="Kimang18/whisper-tiny-khmer-mlx-fp32",
+    fp16=False
 )
+print(result['text']) # print khmer text in SPEECH_FILE_NAME
+```
+Then execute this script to see the result.
+
+You can also use command line in terminal
+
+```bash
+mlx_whisper --model Kimang18/whisper-tiny-khmer-mlx-fp32 --task transcribe SPEECH_FILE_NAME --fp16 False
 ```