D13368: play_piano, lay down UI of the activity and implement working logic and levels.

[Aman Kumar Gupta]

amankumargupta marked an inline comment as done.

REPOSITORY
  R2 GCompris

REVISION DETAIL
  https://phabricator.kde.org/D13368

To: amankumargupta, #gcompris_activities
Cc: kde-edu, #gcompris_activities, himanshuvishwakarma, harrymecwan, ganeshredcobra, nityanandkumar, echarruau, rahulyadav, narvaez, scagarwal, apol, timotheegiet, hkaelberer, jjazeix, bcoudoin
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