Initial version of the E-Invoice solution of JR IT Services

examples/invoice.init.yaml

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+# Invoice input for jr-einvoice
+# Edit this file, then run:
+#   jr-einvoice generate .
+# or from repo root:
+#   jr-einvoice generate <this-folder>
+
+meta:
+  invoice_number: "2026-0001"
+  invoice_date: "2026-02-14"
+  service_date: "2026-02-14"
+  currency: "EUR"
+  language: "de"
+  notes: "Vielen Dank für Ihren Auftrag."
+
+seller:
+  name: "JR IT Services"
+  vat_id: "DE123456789"
+  tax_number: "123/456/78901"
+  email: "johannes@jr-it-services.de"
+  address:
+    street: "Musterstraße 1"
+    postal_code: "80331"
+    city: "München"
+    country: "DE"
+
+buyer:
+  name: "Kunde / Firma"
+  vat_id: null
+  address:
+    street: "Straße 1"
+    postal_code: "00000"
+    city: "Ort"
+    country: "DE"
+
+payment:
+  due_date: "2026-02-28"
+  reference: "Rechnung 2026-0001"
+  iban: "DE02120300000000202051"
+  bic: "BYLADEM1001"
+  bank_name: "Musterbank"
+
+items:
+  - name: "Leistung"
+    description: "Beschreibung"
+    quantity: 1
+    unit: "C62"
+    unit_price_net: 100.00
+    tax_rate: 19.0

examples/invoice.sample.yaml

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+meta:
+  invoice_number: "2026-0001"
+  invoice_date: "2026-02-13"
+  service_date: "2026-02-13"
+  currency: "EUR"
+  language: "de"
+  notes: "Vielen Dank für Ihren Auftrag."
+
+seller:
+  name: "JR IT Services"
+  vat_id: "DE123456789"
+  tax_number: "123/456/78901"
+  email: "johannes@jr-it-services.de"
+  address:
+    street: "Musterstraße 1"
+    postal_code: "80331"
+    city: "München"
+    country: "DE"
+
+buyer:
+  name: "Beispielkunde GmbH"
+  vat_id: "DE987654321"
+  address:
+    street: "Kundenweg 5"
+    postal_code: "10115"
+    city: "Berlin"
+    country: "DE"
+
+payment:
+  due_date: "2026-02-27"
+  reference: "Rechnung 2026-0001"
+  iban: "DE02120300000000202051"
+  bic: "BYLADEM1001"
+  bank_name: "Musterbank"
+
+items:
+  - name: "Beratung (IT)"
+    description: "Technische Beratung und Umsetzung"
+    quantity: 8
+    unit: "HUR"
+    unit_price_net: 120.00
+    tax_rate: 19.0
+
+  - name: "Dokumentation"
+    description: "Projekt-Dokumentation und Übergabe"
+    quantity: 1
+    unit: "C62"
+    unit_price_net: 180.00
+    tax_rate: 19.0