new-calendar-page: Add stub page

data/calendar.gresource.xml

@@ -14,6 +14,7 @@
     <file alias="month-popover.ui" compressed="true">ui/month-popover.ui</file>
     <file alias="month-view.ui" compressed="true">ui/month-view.ui</file>
     <file alias="multi-choice.ui" compressed="true">ui/multi-choice.ui</file>
+    <file alias="new-calendar-page.ui" compressed="true">ui/new-calendar-page.ui</file>
     <file alias="online-account-row.ui" compressed="true">ui/online-account-row.ui</file>
     <file alias="quick-add-popover.ui" compressed="true">ui/quick-add-popover.ui</file>
     <file alias="search-popover.ui" compressed="true">ui/search-popover.ui</file>

data/meson.build

@@ -95,6 +95,7 @@ resource_data = files(
   'ui/month-popover.ui',
   'ui/month-view.ui',
   'ui/multi-choice.ui',
+  'ui/new-calendar-page.ui',
   'ui/quick-add-popover.ui',
   'ui/search-popover.ui',
   'ui/time-selector.ui',

data/ui/new-calendar-page.ui

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="GcalNewCalendarPage" parent="GtkBox">
+    <property name="visible">True</property>
+  </template>
+</interface>