Add pre-packaged dependency libraries (ESP32-audioI2S and PNGdec)

libraries/ESP32-audioI2S/examples/I2Saudio_SD/I2Saudio_SD.cpp

@@ -0,0 +1,53 @@
+//**********************************************************************************************************
+//*    audioI2S-- I2S audiodecoder for ESP32,                                                              *
+//**********************************************************************************************************
+//
+// first release on 11/2018
+// Version 4  , Aug.22/2025
+//
+//
+// THE SOFTWARE IS PROVIDED "AS IS" FOR PRIVATE USE ONLY, IT IS NOT FOR COMMERCIAL USE IN WHOLE OR PART OR CONCEPT.
+// FOR PERSONAL USE IT IS SUPPLIED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR
+// OR COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
+//
+
+#include "Arduino.h"
+#include "Audio.h"
+#include "SPI.h"
+#include "SD.h"
+#include "FS.h"
+
+// Digital I/O used
+#define SD_CS          5
+#define SPI_MOSI      23
+#define SPI_MISO      19
+#define SPI_SCK       18
+#define I2S_DOUT      25
+#define I2S_BCLK      27
+#define I2S_LRC       26
+
+Audio audio;
+
+void my_audio_info(Audio::msg_t m) {
+    Serial.printf("%s: %s\n", m.s, m.msg);
+}
+
+void setup() {
+    Audio::audio_info_callback = my_audio_info;
+    pinMode(SD_CS, OUTPUT);
+    digitalWrite(SD_CS, HIGH);
+    SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
+    SPI.setFrequency(1000000);
+    Serial.begin(115200);
+    SD.begin(SD_CS);
+    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
+    audio.setVolume(12); // 0...21
+    audio.connecttoFS(SD, "test.wav");
+}
+
+void loop(){
+    vTaskDelay(1);
+    audio.loop();
+}