Add Community Specification License (CSL 1.0) files - #317

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac, actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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