Resolves issue #282: Created and added iheartradio svg (#306)

* Created and added iheart radio svg using official art files provided by iheart radio - converted eps to svg

* Reduced iheartradio svg to smallest possible size - 2.2 kb - unable to reach 1kb goal

* Modified logo to just heart to reduce size

* Added table cell to README.MD

* Created new iheartradio from scratch - minified to lowest possible size

* Attempt at reducing iheartradio icon down using a mirror image transform.

* Down to 1116 bytes... so nearly there!

* Fix errors

* Only way to fix is put in xlink namespace.

* Almost there...

* Down to 1065 bytes by rounding to 2 decimal places.

* Rounded to 1 decimal place - 948 bytes... Hoorah!

* Shrink it a little

* Updated readme

images/svg/iheartradio.svg

@@ -0,0 +1,7 @@
+<svg
+xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
+aria-label="iHeartRadio" role="img"
+viewBox="0 0 512 512"><rect
+width="512" height="512"
+fill="#fff"
+rx="15%"/><path id="h" fill="#c6002b" d="M147.4 301.3c-32.3 -28.6 -48.6 -58.4 -48.6 -86.7 0 -28.3 15.9 -57.9 36.9 -71.1 10.3 -4.4 14.6 8.2 8 12.6 -16.7 10.5 -29.9 35.1 -29.9 58.7 0 23.6 14.7 49.6 43.6 75.2 7 8.7 -3.8 16.5 -9.9 11.2zm48.5 -25.5c-21.9 -12.3 -36.6 -36.3 -36.6 -59.4 0 -23.1 12.5 -43.7 32.3 -54 10.5 -3.7 14 9.3 7 13.2 -15 7.8 -24.3 23.3 -24.3 40.2 0.1 18.4 11.7 37.2 29 46.9 8.7 7.1 -0.6 16.7 -7.4 13.2zM256 253.9c-17.9 0 -32.5 -14.5 -32.5 -32.4 0 -17.9 14.6 -32.5 32.5 -32.5v-30.7c-19.4 -28.9 -52.8 -48.8 -90.3 -48.8 -59.6 0 -107.9 48.3 -107.9 107.9 0 37.8 24 65.1 49 90.3l97.9 92.6c6.3 3.9 13.5 1.3 13.6 -5.8v-72.1c0 -20.9 16.9 -37.8 37.8 -37.8z"/><use transform="matrix(-1 0 0 1 512 0)" xlink:href="#h"/></svg>