feat: add OpenDocument PDF templates

src/ccma/assets/templates/Mahnung.fodt

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<office:document xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" office:mimetype="application/vnd.oasis.opendocument.text" office:version="1.3">
+  <office:styles>
+    <style:style style:name="Title" style:family="paragraph"><style:paragraph-properties fo:margin-bottom="0.4cm"/><style:text-properties fo:font-size="18pt" fo:font-weight="bold"/></style:style>
+    <style:style style:name="Heading" style:family="paragraph"><style:paragraph-properties fo:margin-top="0.35cm" fo:margin-bottom="0.15cm"/><style:text-properties fo:font-size="12pt" fo:font-weight="bold"/></style:style>
+  </office:styles>
+  <office:body>
+    <office:text>
+      <text:p text:style-name="Title">Chaos Computer Club Mannheim e.V.</text:p>
+      <text:p>{{document.date}}</text:p>
+      <text:p>An {{member.full_name}} ({{member.number}})</text:p>
+      <text:p text:style-name="Heading">{{reminder.name}}</text:p>
+      <text:p>Zu unserer Forderung „{{claim.title}}“ ist weiterhin ein Betrag von {{claim.balance}} offen.</text:p>
+      <text:p>Bitte begleiche den offenen Betrag innerhalb von {{reminder.payment_deadline_days}} Tagen.</text:p>
+      <text:p>Mahngebühr: {{reminder.fee}}</text:p>
+      <text:p>{{reminder.detail}}</text:p>
+      <text:p>Forderungs-ID: {{claim.id}}</text:p>
+      <text:p>Mahnstufe: {{reminder.level}}</text:p>
+    </office:text>
+  </office:body>
+</office:document>