provide a first iteration for a rez security policy

Signed-off-by: Stephen Mackenzie <maxnbk@users.noreply.github.com>

Author: maxnbk

SECURITY.md

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+<!-- SPDX-License-Identifier: Apache-2.0 -->
+<!-- Copyright Contributors to the Rez Project -->
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you think you've found a potential vulnerability in rez, please
+report it by filing a GitHub [security
+advisory](https://github.com/AcademySoftwareFoundation/rez/security/advisories/new). Alternatively,
+email security@rez-project.io and provide your contact info for further
+private/secure discussion.  If your email does not receive a prompt
+acknowledgement, your address may be blocked.
+
+Our policy is to acknowledge the receipt of vulnerability reports
+within 48 hours. Our policy is to address critical security vulnerabilities
+rapidly and post patches within 14 days if possible.
+
+## Known Vulnerabilities
+
+There are currently no known reported vulnerabilities.
+
+See the [release notes](CHANGES.md) for more information.
+
+## Supported Versions
+
+In general, the rez project release strategy is purely sequential, and we will drop support for any
+major version which is not the current development major version. However, we may at our discretion issue
+patches for prior major versions with compelling reasoning. The rez project team takes compatibility very
+seriously, deprecations are telegraphed, and forward compatibility is incredibly important, making it
+reasonable to expect that users of rez attempt to stay close to the newest version as possible.
+
+## Signed Releases
+
+Signed releases are not yet supported.
+
+We plan to add signed releases soon. The following details are speculative but likely:
+
+Release artifacts are signed via
+[sigstore](https://www.sigstore.dev). See
+[release-sign.yml](.github/workflows/release-sign.yml) for details.
+
+To verify a downloaded release at a given tag:
+
+    % pip install sigstore
+    % sigstore verify github --cert-identity https://github.com/AcademySoftwareFoundation/rez/.github/workflows/release-sign.yml@refs/tags/<tag> rez-<tag>.tar.gz
+
+## Security Expectations
+
+### Software Features
+
+- The rez project implements a package management solution that is agnostic
+  to build system, shell, platform, architecture, operating system, or
+  packaged toolset. rez can be used to package python, javascript, C++, or
+  even binaries. As long as it is possible to express the way your package
+  modifies the environment to expose itself to be consumed, rez can package it.
+
+- rez is implemented in python, and consists primarily of simply its own
+  source, a handful of vendored python packages, and is installed to a system
+  in the form of a virtualenv-powered executable, tied to a python interpreter.
+
+- rez exposes a robust CLI which can be used to do common operations like build
+  or release packages, to resolve and drop into a shell for a given environment,
+  or to freeze context files that can be used to bake and reuse resolves.
+
+- rez exposes an API that can be used, in and out of isolation, to perform many
+  of the same tasks, as well as more granular operations, so that groups can
+  also leverage many of the low-level constructs that make the higher-level CLI
+  usages possible.
+  
+- rez reads and writes to/from stdout, as well as to/from json-like rxt files.
+  rez also writes temporary shell context files like .sh or .bat scripts on a
+  shell-by-shell basis, as a shell entrypoint into the chosen environment.
+
+- rez exposes a rich plugin system which can be used and configured in order to
+  augment and expand its use-cases or integrations per the users preferences.
+
+- rez will engage in network calls only if configured to do so. Typically, this
+  would be the case with the built-in `memcached` functionality, or to publish
+  `amqp` messages on package release.
+
+- rez does not handle, or expect to handle, any sort of login credentials to any
+  network, file system, or verson-control system. rez expects that these details
+  are handled independently and outside of rez.
+
+- rez packages can, by definition and by design, result in the execution of
+  arbitrary code. It is critical that users of rez maintain their own strict
+  control over their own package repositories, and not trust arbitrary packages
+  given to them by unknown sources. rez takes no responsibility for malicious
+  effects caused by the execution of packages.
+  
+### Software Dependencies
+
+rez depends on python and virtualenv, in order to be installed.
+
+At runtime, without any user-provided plugins, rez depends on the following
+table of vendored packages, their versions, and details related to any
+modifications made:
+
+[Vendored Packages](https://github.com/AcademySoftwareFoundation/rez/blob/main/src/rez/vendor/README.md)
+
+### Potential Vulnerabilities
+
+It is expected that maliciously crafted packages, or rxt files, could cause any
+type of issue that would ordinarily be causable as the result of a json file load,
+or an arbitrary code execution. Do not use or consume packages or context files
+provided from untrusted sources without undue validation, care, or sandboxing.
+
+#### Development Cycle and Distribution
+
+rez is downloadable and buildable as (mostly) python source via the GitHub
+releases page. Only members of the project's Technical Steering Committee have
+write permissions on the source code repository. All critical software changes
+are reviewed by at least one TSC member.
+
+rez is also distributed as a [pypi](https://pypi.org/project/rez/) package,
+however this distribution is not yet usable as a so-called "production install",
+for which details can be found in the
+[docs](https://rez.readthedocs.io/en/stable/installation.html#installation-via-pip).
+This may change in the future.