Add Getting started

Getting-started.md

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+# Getting Started
+
+## Prerequisites
+
+- **Python 3.8 or higher**
+- **FFmpeg** – required for audio processing
+
+### Install FFmpeg
+
+| OS | Command |
+|---|---|
+| **Ubuntu/Debian** | `sudo apt install ffmpeg` |
+| **macOS (Homebrew)** | `brew install ffmpeg` |
+| **Windows** | Download from [ffmpeg.org](https://ffmpeg.org/download.html) |
+
+---
+
+## Installation
+
+### From Source (CLI)
+
+```bash
+git clone https://git.vmn.su/max/audio_splitter.git
+cd audio_splitter
+pip install .