Tweak SECURITY.md and move to top-level directory.

Author: puneetmatharu

ML-Frameworks/pytorch-aarch64/SECURITY.md

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+# Security Policy: DO NOT USE IN PRODUCTION
+
+> [!WARNING]
+> This contains software which is
+> - built from unreleased, development branches
+> - with experimental features in active development
+> - minimally tested
+> - DO NOT USE IN PRODUCTION
+> - FOR EVALUATION ONLY
+>
+> Release versions of PyTorch are available from: https://pypi.org/project/torch/
+
+## Supported Versions
+
+Our policy for fixing released versions is that we will only patch the latest
+release, not all affected releases. This project operates a rolling calendar
+release, fixes may come in future releases, but they will not be backported.
+
+## Reporting a Vulnerability
+
+If you find a vulnerability in `Tool-Solutions/ML-Frameworks/pytorch-aarch64` or
+`Tool-Solutions/ML-Frameworks/tensorflow-aarch64`, report it to the relevant upstream
+project first. Otherwise email psirt@arm.com with a description of the vulnerability.