Make simple explination html & linking page

[AnthonyAstige]

What to add to page

1. Explanation what this is
2. Link to android app
3. Link to iTunes app
4. Link to web app (See Setup github pages hosting #7 with functional web prototype at http://www.codeforeauclaire.org/bikeroutes/)
   1. Or maybe just make this the page it's self, and link to apps from that page?

Related #7 (Put it at index.html)