add ref to README.md to examples

Author: pschatzmann

examples/adc-a2dp/adc-a2dp.ino

@@ -1,3 +1,12 @@
+/**
+ * @file adc-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/adc-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ * 
+ */
 #include "Arduino.h"
 #include "BluetoothA2DPSource.h"
 #include "AudioTools.h"

examples/adc-serial/adc-serial.ino

@@ -1,3 +1,12 @@
+/**
+ * @file adc-serial.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/adc-serial/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+ 
 #include "Arduino.h"
 #include "BluetoothA2DPSource.h"
 #include "AudioTools.h"

examples/file_mp3-a2dp/file_mp3-a2dp.ino

@@ -1,3 +1,12 @@
+/**
+ * @file file_mp3-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/file_mp3-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
 #include <SPI.h>
 #include <SD.h>
 #include "AudioFileSourceSD.h"

examples/file_raw-a2dp/file_raw-a2dp.ino

@@ -1,3 +1,11 @@
+/**
+ * @file file_raw-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/file_raw-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
 
 #include "BluetoothA2DPSource.h"
 #include <SPI.h>

examples/file_raw-serial/file_raw-serial.ino

@@ -1,3 +1,12 @@
+/**
+ * @file file_raw-serial.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/file_raw-serial/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
 #include <Arduino.h>
 #include <SPI.h>
 #include <SD.h>

examples/i2s-a2dp/i2s-a2dp.ino

@@ -1,13 +1,18 @@
+/**
+ * @file i2s-a2dp.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/i2s-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+
 #include "Arduino.h"
 #include "AudioTools.h"
 
 using namespace audio_tools;  
 
-/**
- * @brief We use a ADS1015 I2S microphone as input and send the data to A2DP
- * Unfortunatly the data type from the microphone (int32_t)  does not match with the required data type by A2DP (int16_t),
- * so we need to convert.
- */ 
 
 BluetoothA2DPSource a2dp_source;
 I2S<int32_t> i2s;

examples/i2s-serial/i2s-serial.ino

@@ -1,3 +1,12 @@
+/**
+ * @file i2s-serial.ino
+ * @author Phil Schatzmann
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/i2s-serial/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
 #include "Arduino.h"
 #include "AudioTools.h"
 #include "BluetoothA2DPSource.h"

src/AudioOutputWithCallback.h

@@ -10,6 +10,8 @@ namespace audio_tools {
 /**
  * @brief ESP8266Audio AudioOutput class which stores the data in a temporary buffer. 
  * The buffer can be consumed e.g. by a callback function by calling read();
+ * @author Phil Schatzmann
+ * @copyright GPLv3
  */
 class AudioOutputWithCallback : public AudioOutput
 {