Update index.html

Author: gabrielgggg

index.html

@@ -209,6 +209,7 @@ <h5 class="modal-title" id="devlabel">Default and Development</h5>
 
 <li class="paper"><mark>"Solving default models,"</mark> <div class="btn-group btn-group-sm" role="group">
 <a href="./docs/OREEF_solving.pdf" class="btn btn-light">PDF</a> <a href="https://doi.org/10.1093/acrefore/9780190625979.013.941" class="btn btn-light">DOI</a>
+  <a href="https://github.com/gabrielgggg/defaultModel" class="btn btn-light">Code</a>
 <button type="button" class="btn btn-light" data-toggle="modal" data-target="#oreefModal">Bib</button></div><br>
 <strong>Oxford Research Encyclopedia of Economics and Finance</strong>, 2025
 <div class="modal fade" id="oreefModal" tabindex="-1" role="dialog">