docs: Add energy consumption info

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

admin_manual/contents.rst

@@ -27,3 +27,4 @@ Table of contents
     maintenance/index
     issues/index
     gdpr/index
+    declarations/index

admin_manual/declarations/energy_consumption.rst

@@ -0,0 +1,17 @@
+==================
+Energy consumption
+==================
+
+The Green Metrics Tool is certified under the `Blue Angel for Software DE-UZ 215 <https://www.blauer-engel.de/en/productworld/software>`_.
+
+This page contains the typical energy consumption according to the Standard Usage Scenarios used in the certification.
+
+Initial Certification 2024/2025
+-------------------------------
+
+`Download Report 2024/2025 <https://portal.nextcloud.com/assets/files/Anlage_7_2024_2025.pdf>`_
+
+Certification Extension 2025/2026
+---------------------------------
+
+`Download Report 2025/2026 <https://portal.nextcloud.com/assets/files/Anlage_7_2025_2026.pdf>`_

admin_manual/declarations/index.rst

@@ -0,0 +1,8 @@
+============
+Declarations
+============ 
+
+.. toctree::
+    :maxdepth: 2
+
+    energy_consumption