Added file contributer info

Author: notactuallyfinn

.github/workflows/python-app.yml

@@ -1,5 +1,9 @@
-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+# SPDX-FileCopyrightText: 2024 German Aerospace Center (DLR)
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# SPDX-FileContributor: Michael Meinel
+# SPDX-FileContributor: Michael Fritzsche
 
 name: Python application