add readme file

scripts/AudioConverter/README.md

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+# Audio Converter
+
+CLI tool to convert an audio file from one extension to another (e.g. mp3 to wav)
+
+## Requirements
+- [FFmpeg](https://ffmpeg.org/)
+
+## Usage
+
+### Convert all audio files in a specific directory
+```bash
+python3 audio-converter.py -p <YOUR-PATH-WAS-HERE> -e <THE-DESIRED-EXTENSION>
+```
+
+e.g.
+```bash
+python3 audio-converter.py -p /home/username/Music -e .wav
+```
+
+### Convert specific audio file
+```bash
+python3 audio-converter.py -p <YOUR-PATH-WAS-HERE> -e <THE-DESIRED-EXTENSION>
+```
+
+e.g.
+```bash
+python3 audio-converter.py -p /home/username/Music/test.mp3 -e .wav
+```