feat: notify configured recipients when something is booked

templates/email/series_created.html.twig

@@ -0,0 +1,37 @@
+{% extends 'email/layout.html.twig' %}
+
+{# One mail for the whole series -- see BookingNotifier for why it is not one per occurrence. #}
+{% block body %}
+    {% set resource = series.resource %}
+    <h1>Neue Serienbuchung</h1>
+
+    <p>
+        <strong>{{ resource.type.label }} {{ resource.label }}</strong> wurde als Serie gebucht.
+    </p>
+
+    <p>
+        Zeitraum: {{ series.startDate|format_datetime(pattern: 'd. MMMM y') }}
+        bis {{ series.endDate|format_datetime(pattern: 'd. MMMM y') }}
+        <br>
+        Rhythmus: {{ series.describe }}
+        <br>
+        Termine: {{ result.createdCount }}
+        {% if resource.group %}
+            <br>
+            {{ resource.type.groupLabel }}: {{ resource.group.label }}
+        {% endif %}
+    </p>
+
+    {% if result.skippedCount > 0 %}
+        <p class="small">
+            {{ result.skippedCount }} Tage waren bereits vergeben und wurden übersprungen:
+            {{ result.skippedDates|join(', ') }}
+        </p>
+    {% endif %}
+
+    <p>
+        Gebucht von {{ series.user.name }}
+        <br>
+        {{ series.user.email }}
+    </p>
+{% endblock %}