Add Slithering Sinewave Background Object

...ges/MiddleLayer/SlitheringSineWave/SlitheringSineWave.xcf

...s/MiddleLayer/SlitheringSineWave/SlitheringSineWave_1.png

...s/MiddleLayer/SlitheringSineWave/SlitheringSineWave_2.png

...s/MiddleLayer/SlitheringSineWave/SlitheringSineWave_3.png

...s/MiddleLayer/SlitheringSineWave/SlitheringSineWave_4.png

...s/MiddleLayer/SlitheringSineWave/SlitheringSineWave_5.png