fix: add SPDX license information to documentation files

Signed-off-by: Nora Blomaard <[email protected]>

Author: noraeb

.github/CODEOWNERS

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2022 Alliander N.V.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 # All members of the @com-pas/Alliander team are code owners for this repository
 
 *   @com-pas/Alliander

CODE_OF_CONDUCT.md

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2023 Alliander N.V.
+
+SPDX-License-Identifier: Apache-2.0
+-->
 # Code of Conduct
 
 This project follows the CoMPAS Code of Conduct. Please see the [Code of Conduct documentation](https://com-pas.github.io/contributing/#code-of-conduct) for details on our community standards and expectations.

GOVERNANCE.md

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2023 Alliander N.V.
+
+SPDX-License-Identifier: Apache-2.0
+-->
 # Governance
 
 This project follows the CoMPAS governance model. See the [governance documentation](https://com-pas.github.io/contributing/GOVERNANCE.html) for details.

SUPPORT.md

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2023 Alliander N.V.
+
+SPDX-License-Identifier: Apache-2.0
+-->
 # Support
 
 For support and help, see the [CoMPAS contributing guide](https://com-pas.github.io/contributing/SUPPORT.html).