Update README.md

Author: NebiyouTen

README.md

@@ -1,9 +1,21 @@
-# Alsa_Wave_Play
+# Alsa_Wave_Playback and Capture
 
-A simple C program that uses the ALSA audio library to play wav files. [Here](https://www.alsa-project.org/wiki/Download) is the link to the ALSA linux library. The program parses wav files and writes the data buffer to a sound card. Parsing wav files and headers was based on [this](http://truelogic.org/wordpress/2015/09/04/parsing-a-wav-file-in-c/) tutorial. 
+A simple C program that uses the ALSA audio library to play and record wav files. [Here](https://www.alsa-project.org/wiki/Download) is the link to the ALSA linux library. 
 
-To run use 
+## PCM_Playback
+The program parses wav files and writes the data buffer to a sound card. Parsing wav files and headers was based on [this](http://truelogic.org/wordpress/2015/09/04/parsing-a-wav-file-in-c/) tutorial. 
+
+## PCM_Capture
+The program opens an audio stream form an UAC222 audio device and writes it to a wav file. Wav file header is generated and 
+data will be buffered to the file. The output of this capture can be played back with the above program. 
+
+To run use the following commands
 ```
-./gcc_compile_script && PCM_Wav_Play
+./gcc_compile_script && ./PCM_Wav_Play
+```
+
 ```
-It generates  executlabe file. 
+./gcc_compile_script && ./PCM_Capture
+```
+
+