examples: added daily-custom-tracks

examples/daily-custom-tracks/README.md

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+# Daily Custom Tracks
+
+This example shows how to send and receive Daily custom tracks. We will run a simple `daily-python` application to send an audio file with a custom track (named "pipecat") to a room. Then, the Pipecat bot will mirror that custom track into another custom track (named "pipecat-mirror") in the same room.
+
+## Get started
+
+```python
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+```
+
+## Run the bot
+
+Start the bot by giving it a Daily room URL.
+
+```bash
+python bot.py -u ROOM_URL
+```
+
+The bot will wait for the first participant to join. Then, it will mirror a custom track named "pipecat" into a new custom track named "pipecat-mirror".
+
+## Run the sender
+
+Now, run the custom track sender. This is a simple `daily-python` application that opens and audio file and sends it as a custom track to the same Daily room.
+
+```bash
+python custom_track_sender.py -u ROOM_URL -i office-ambience-mono-16000.mp3
+```
+
+## Open client
+
+Finally, open the client so you can hear both custom tracks.
+
+```bash
+open index.html
+```
+
+Once the client is opened, copy the URL of the Daily room and join it. You should be able to select which custom track you want to hear.