Add markdown icon (#252)

* Add markdown into README

* Added background, better whitespace.

README.md

@@ -182,6 +182,7 @@ Say thanks!
 </tr>
 <tr>
 <td>Unicode<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/unicode.svg" width="125" title="The Unicode Consortium" /><br>879 Bytes</td>
+<td>Markdown<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/markdown.svg" width="125" title="markdown" /><br>440 Bytes</td>
 </tr>
 </table>
 

images/svg/javascript.svg

@@ -1,6 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg"
-aria-label="javascript" role="img"
-viewBox="0 0 512 512"><rect
-width="512" height="512"
-rx="15%"
-fill="#f7df1e"/><path d="m324,370c10,17 24,29 47,29 20,0 33,-10 33,-24 0,-16 -13,-22 -35,-32l-12,-5c-35,-15 -58,-33 -58,-72 0,-36 27,-64 70,-64 31,0 53,11 68,39l-37,24c-8,-15 -17,-21 -31,-21 -14,0 -23,9 -23,21 0,14 9,20 30,29l12,5c41,18 64,35 64,76 0,43 -34,67 -80,67 -45,0 -74,-21 -88,-49zm-170,4c8,13 14,25 31,25 16,0 26,-6 26,-30V203h48v164c0,50 -29,72 -72,72 -39,0 -61,-20 -72,-44z"/></svg>

images/svg/markdown.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="Markdown" role="img"
+viewBox="0 0 512 512"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><path d="M410,366H102C88,366 76,354 76,340V170c0,-14 12,-26 26,-26h307c14,0 26,12 26,26v170c0,14 -11,26 -25,26zM102,162c-4,0 -9,4 -9,9v170c0,5 4,9 9,9h307c5,0 9,-4 9,-9V170c0,-5 -4,-9 -9,-9 1,0 -307,0 -307,0zm26,153V196h34l34,43 34,-43H265V314h-34v-68l-34,43 -34,-43v68zm216,0 -52,-57h34v-61h34v60h34z"/></svg>