Add dark mode switch

web/plates/settings.html

@@ -56,6 +56,21 @@
                 </div>
             </div>
         </div>
+<!-- App Theme -->
+        <div class="panel-group col-sm-12">
+            <div class="panel panel-default">
+                <div class="panel-heading">Theme</div>
+                <div class="panel-body">
+                    <!-- Dark Mode -->
+                    <div class="form-group">
+                        <label class="control-label col-xs-7">Dark Mode</label>
+                        <div class="col-xs-5">
+                            <ui-switch ng-model='DarkMode' settings-change></ui-switch>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
     </div>
 <!-- End Left Col -->
 <!-- Begin Right Col -->