chore: add README for ESP32

01OS/01OS/clients/esp32/README.md

@@ -0,0 +1,11 @@
+# ESP32 Playback
+
+To set up audio recording + playback on the ESP32 (M5 Atom), do the following:
+
+1. Open Arduino IDE, and open the `playback/playback.ino` file
+2. Go to Tools -> Board -> Boards Manager, search "esp32", then install the boards by Arduino and Espressif
+3. Go to Tools -> Manage Libraries, then install the following:
+    - M5Atom by M5Stack
+    - WebSockets by Markus Sattler
+4. The board needs to connect to WiFi. Go to the playback.ino code, then add your IP to COMPUTER_IP (line 15) and add your WiFi details (line 180). To find IP on macOS run `ipconfig getifaddr en0` in a terminal window.
+5. To flash the .ino to the board, connect the board to the USB port, select the port from the dropdown on the IDE, then select the M5Atom board (or M5Stack-ATOM if you have that). Click on upload to flash the board.