Update read&write.md with video and audio file handling

Author: SohamTilekar

docs/getting_started/read&write.md

@@ -20,6 +20,25 @@ Other clip type inherent it from the `VideoClip`.
 ```python
 import vidiopy
 video = vidiopy.VideoFileClip("path/to/video.extension")
-video.write_videofile("path/to/output/video.extension", fps=30)
+video.write_videofile("path/to/output/video.extension", fps=30) # fps is optional it will default use the fps of the video if it is set
+```
+
+## Reading Audio from file
+
+To read the audio from the file we can use the `AudioFileClip` class. This class takes the path of the audio file as input and returns a audio which inherits from `AudioClip` class.
 
+```python
+import vidiopy
+audio = vidiopy.AudioFileClip("path/to/audio.extension")
+```
+
+## Writing Audio to file
+
+To Write the Audio we can use the `write_audiofile` function inside the `AudioClip`.
+Other clip type inherent it from the `AudioClip`.
+
+```python
+import vidiopy
+audio = vidiopy.AudioFileClip("path/to/audio.extension")
+audio.write_audiofile("path/to/output/audio.extension")
 ```