Update index.html

Author: gaimerI

index.html

@@ -73,10 +73,13 @@
                         <li>
                             <label for="file-extension">Default file extension:</label>
                             <select class="ui" id="file-extension">
-                                <option value="txt">.txt</option>
-                                <option value="md">.md</option>
-                                <option value="html">.html</option>
-                                <option value="js">.js</option>
+                                <option value="txt">.txt (Plaintext)</option>
+                                <option value="md">.md (Markdown)</option>
+                                <option value="html">.html (HyperText Markup Language)</option>
+                                <option value="js">.js (JavaScript)</option>
+                                <option value="svg">.svg (Scalable Vector Graphics)</option>
+                                <option value="md">.obj (Wavefront OBJ)</option>
+                                <option value="html">.csv (Comma Separated Values)</option>
                             </select>
                         </li>
                         <li>