Add copyright and license information for Kokkos slides

Author: jussienko

kokkos/docs/01-introduction-kokkos.md

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+<!--
+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title:  Introduction to Kokkos Performance Portability Ecosystem
 subtitle: Portable GPU Programming

kokkos/docs/02-simple-parallelism.md

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+<!--
+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title:  Data parallel patterns in
 subtitle: Portable GPU Programming

kokkos/docs/03-views-spaces.md

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+<!--
+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: Spaces and Views 
 event: Portable GPU Programming 2025

kokkos/docs/04-memory-layout-mdrange.md

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+<!--
+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: Performance portable memory access patterns 
 event: Portable GPU Programming 2025

kokkos/docs/05-interoperability-kernels-tools.md

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+<!--
+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
 ---
 title: Interoperability, Kernels and Tools
 event: Portable GPU Programming 2025

kokkos/docs/img/gpu-bws.png.license

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+SPDX-FileCopyrightText: 2025 CSC - IT Center for Science Ltd. <www.csc.fi>
+
+SPDX-License-Identifier: CC-BY-4.0