Todo:
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when timer is up, make a sound. (Added 5/9/20)
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Also have several sounds to choose from.
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button to stop sound
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send a text message
demo - https://hsien-hsiuliao.github.io/pomodoro-timer/
Reference:
http://soundbible.com/free-sound-effects-1.html
https://www.w3schools.com/jsref/met_audio_play.asp