Added Local Audio Source Provider

music_assistant/providers/local_audio_source/README.md

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+# Local Audio Source — the AUX-in cable for Music Assistant
+
+> Local Audio Source is Music Assistant’s **Virtual AUX Input**, letting you capture any audio from your PC (ALSA via arecord) and stream it to any Music Assistant player.
+
+---
+
+## ✨ What it does
+
+- **Bring outside audio into Music Assistant.** Use your computer as the bridge.  
+- **Any ALSA input.** Line-in jacks, USB audio interfaces, or built-in mic/line sources.  
+- **Simple to set up.** Choose the input, start the stream, and it shows up as a source in your players.  
+- **Custom source personalization.** Give it your own display name and thumbnail image for a polished, personalized feel in the Music Assistant UI.  
+
+---
+
+## 🧩 Use cases
+
+- **Quick-Connect Bluetooth Receiver**  
+  Plug a Quick Connect BT receiver into your PC’s line-in. Anyone can quickly pair their phone without having to confirm the connection, and their music instantly plays across your whole-house system.
+
+- **Announcements & Paging Microphone**  
+  Plug in a USB microphone and use it for announcements. Great for paging in a business, office, or house intercom setup.
+
+- **Vinyl Turntable/Player**  
+  Connect your turntable (via phono preamp) directly to your PC’s line-in, and enjoy your vinyl collection throughout your Music Assistant ecosystem.
+
+---
+
+## ✅ Requirements
+
+- **Music Assistant** server.  
+- **Linux host** with ALSA.  
+- A capture device (line-in, USB interface, mic, etc).  
+
+---
+
+## ⚙️ Configuration
+
+- **Display Name** – what shows up in source lists.  
+- **Thumbnail Image (URL)** – optional icon.  
+- **Audio Input Device** – detected ALSA devices or manual entry (`alsa:hw:X,Y`).  
+- **Sample Rate** – 44.1kHz or 48kHz.  
+- **Channels** – mono or stereo.  
+- **Period/Buffer (µs)** – tuning for latency vs stability.  
+
+> ℹ️ Run `arecord -l` to list devices.  
+
+---
+
+## ▶️ Using it
+
+1. Select **Local Audio Source** as the input on your player.  
+2. Start playback—it streams live from your chosen device.  
+3. Stop when done; the plugin cleans up automatically.  
+
+---
+
+## 📦 Docker notes
+
+If you’re running Music Assistant in Docker, you need to give the container access to your audio devices.  
+
+### ALSA devices
+```yaml
+services:
+  music-assistant:
+    image: ghcr.io/music-assistant/server:latest
+    devices:
+      - /dev/snd:/dev/snd   # forward ALSA devices
+    group_add:
+      - "audio"