Add button to clear register item form

app/static/js/items.js

 $(document).ready(function() {
 
+  $("#clear").click(function() {
+    // clear all select fields
+    $("select").val('');
+  });
+
   var items_table =  $("#items_table").DataTable({
     "ajax": function(data, callback, settings) {
       $.getJSON(

app/templates/inventory/create_item.html

@@ -28,6 +28,7 @@
     <div class="form-group row">
       <div class="col-sm-10">
         <button type="submit" class="btn btn-primary">Submit</button>
+        <button type="button" class="btn btn-primary" id="clear">Clear</button>
       </div>
     </div>
   </form>