Add autobook feature

popup/popup.html

@@ -64,6 +64,14 @@
                 <input type="number" class="form-control" id="deltaNow" placeholder="days">
             </div>
         </div>
+        <div class="row">
+            <div class="col">
+                <div class="form-check form-switch" style="text-align: left;">
+                    <input class="form-check-input" type="checkbox" role="switch" id="autobook">
+                    <label class="form-check-label" for="autobook">Autobook</label>
+                </div>
+            </div>
+        </div>
         <div class="row">
             <div class="col">
                 <p>Status: <span id="status">Inactive</span></p>