add LICENSE

LICENSE

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+Gemma Terms of Use
+
+Gemma is provided under and subject to the Gemma Terms of Use found at
+https://ai.google.dev/gemma/terms
+
+This checkpoint is a derivative of Google's Gemma model and remains subject to:
+- Gemma Terms of Use:          https://ai.google.dev/gemma/terms
+- Gemma Prohibited Use Policy: https://ai.google.dev/gemma/prohibited_use_policy
+
+Commercial use is permitted under these terms. By downloading or using this
+checkpoint you agree to the Gemma Terms of Use and the Prohibited Use Policy,
+and you must pass these terms and restrictions to any downstream recipient.