Add Samsung logo (SVG) (#454)

* Added samsung_s.svg, samsung_swoop.svg and samsung.svg.

* Added Samsung icon to README.md.
Added reference image to images/reference/samsung.svg and updated images/reference/index.md correspondingly.

* Reduced the size of samsung_swoop.svg by 73 bytes.

* Added samsung_s.svg to README.txt and reference/index.md.
Removed samsung_swoop.svg.

images/svg/samsung_s.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="Samsung" role="img"
+viewBox="0 0 512 512" fill="#117cad"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><path d="m 292.588,332.165 c 3.486,8.609 2.419,19.708 0.783,26.396 -2.988,11.811 -11.028,23.906 -34.65,23.906 -22.341,0 -35.859,-12.807 -35.859,-32.302 l 0,-34.436 -95.482,0 -0.071,27.535 c 0,79.331 62.469,103.309 129.421,103.309 64.39,0 117.396,-21.986 125.792,-81.324 4.34,-30.736 1.067,-50.872 -0.356,-58.485 -15.013,-74.493 -150.124,-96.763 -160.157,-138.385 -1.708,-7.115 -1.21,-14.728 -0.356,-18.783 2.49,-11.313 10.246,-23.835 32.515,-23.835 20.776,0 33.084,12.878 33.084,32.302 0,6.546 0,21.985 0,21.985 l 88.723,0 0,-24.973 c 0,-77.553 -69.584,-89.648 -119.958,-89.648 -63.323,0 -115.048,20.918 -124.511,78.833 -2.561,16.009 -2.917,30.238 0.783,48.097 15.582,72.643 141.943,93.704 160.299,139.808 z" fill="#034ea2"/></svg>