Added Project Euler Pic

input/index.md

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 </div>
 
+<div style="width: 200px; height: 60px; margin-left: auto; margin-right: auto;">
+<a href="http://projecteuler.net/problems"><img src="http://projecteuler.net/profile/xythobuz.png" alt="Project Euler profile"></a>
+</div>
+
  [fs]: http://www.gnu.org/philosophy/free-sw.html
  [gh]: https://github.com/xythobuz