    This line connects the Tag UID with the aformentioned directory plus the number of the track
    with which to start playback:
    
-      46722634231761290   is the UID of the NFC Tag
-      findorie            is the directory from which to play the files
-      1                   is the number of the track with which to start playback - here the 1st track
-
-  
-   The program will take the retrieved information and then start a for-loop beginning with 
-   the provided first track until all consecutive numbered tracks are played - for this it counts the 
-   number of files in the given dierctory. 
-   
-   After playback of all files is finished, the program will resume it's main loop, delay operation 
-   for roughly 15 seconds (to give the user the chance to remove the just used Tag from the reader) 
-   and then wait until it detects the next tag.
-   
-   While advancing through the files in the directory, the program will update the TrackDB-File with  
-   the number of the currently played track. Doing so allows for interrupted playbacks - tag is   
-   removed and later put back on when the playback will start with the last track in playback. 
-   
+      46722634231761290   the UID of the NFC Tag
+      findorie            the directory from which to play the files
+      1                   the number of the track with which to start playback - here the 1st 
+
+   To use this implementation you need to activate the configuration   NFCTRACKDB   
+   You will also need to create the necessary TrackDb files. This can be done with the program
+   createTrackDb.ino from this repository.
+   
+   
+   Playback and controls
+   ---------------------------------------------------------------------------------------
+   Regardless of the way the program retrieved the information on which directory to play 
+   (NDEF message or TrackDB), it will store this in the global var plrCurrentFolder and then 
+   start a for-loop beginning with the provided first track until all consecutive numbered 
+   tracks are played - for this it counts the number of files in the given dierctory. 
+   
+   While the album (or file) is played an operations light is fading up and down in intensity. 
+   
+   After playback of all files is finished, the program will resume it's main loop, delay 
+   operation for roughly 15 seconds (to give the user the chance to remove the just used Tag 
+   from the reader) and then wait until it detects the next tag.
+   
+   While advancing through the files in the directory, the program will update the TrackDB-File 
+   with  the number of the currently played track. Doing so allows for interrupted playbacks - 
+   tag is removed and later put back on when the playback will start with the last track in 
+   playback. 
+   
+   
+   Restrictions
+   ---------------------------------------------------------------------------------------
    For this to work, a couple of restrictions are in place:
    1. All filenames must be in the format  trackXXX.mp3, where XXX is a numbering from 001 to 127
    2. Follows from 1: You can have a maximum of 127 files per directory. I use a char to count the

   - Next Track           - play the next track in a consecurtive list of ordered files
   - Pause / Resume       - pauses the playback or unpauses a paused playback
   - Light on / off       - turn the operations light fader on or off


   Some features (as e.g. Remote Control, Buttons or operation LED etc.) can be turned off 
   or on via #define switches in the code below.
   
   Used Pins:
     NAME             PIN  USAGE
   - CLK / PN532_SCK   13  SPI Clock shared with VS1053, SD card and NFC breakout board 
   - MISO / PN532_MISO 12  Input data from VS1053, SD card and NFC breakout board 

   - no directory found on the SD card that match the NFC Tag TrackDB record
   - no file(s) in the directory on the SD card


   Controls
   ---------------------------------------------------------------------------------------
   4 buttons are included:
   - Previous Track       - play the previous track in a consecurtive list of ordered files
   - Next Track           - play the next track in a consecurtive list of ordered files
