FIXED sugarlabs#473 Updated Images (sugarlabs#479 )

* Delete chords.png

* Delete putting-it-all-together.png

* Add files via upload

* Update README.md

* Update README.md

* Delete Screenshot-1.png

* Create Screenshot-1.png

* Add files via upload

* Delete Screenshot-1.png

* Create ,

* Add files via upload

* Delete ,

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