Add SECURITY.md with disclosure instructions that references the main TensorFlow repo security policy.

PiperOrigin-RevId: 465476558

Author: tensorflower-gardener

google3/third_party/tensorflow_model_optimization/opensource/SECURITY.md

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+# TensorFlow Model Optimization Toolkit Security
+
+Please refer to [TensorFlow’s security model and guidelines][tf-security].
+
+To report any security related issues, please email `[email protected]`
+[as described in TensorFlow’s `SECURITY.md`][email]. Consult that document for
+details, including an encryption key for especially sensitive disclosures.
+
+[email]: https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md#reporting-vulnerabilities
+[tf-security]: https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md