Add tnh loving kindness song

static/media/audio.json

     "sandy-beach-calm-waves-water-nature-sounds-8052.mp3": "Sandy Beach - Calm Waves - Water - Nature Sounds",
     "evening-birds-singing-in-spring-background-sounds-of-nature-146388.mp3": "Evening birds singing in spring",
     "lit-fireplace-6307.mp3": "Lit fireplace",
-    "mad-scientist-lab-loopable-71170.mp3": "Mad scientist lab (steampunk)"
+    "mad-scientist-lab-loopable-71170.mp3": "Mad scientist lab (steampunk)",
+    "loving-kindness-tnh-song.mp3": "Loving kindness song by Thich Nhat Hahn"
 }