Add MIT license and security policy.

LICENSE

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+MIT License
+
+Copyright (c) 2025 Fastly
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

SECURITY.md

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+## Report a security issue
+
+The project team welcomes security reports and is committed to providing prompt attention to security issues. Security issues should be reported privately via [Fastly’s security issue reporting process](https://www.fastly.com/security/report-security-issue).
+
+## Security advisories
+
+Remediation of security vulnerabilities is prioritized by the project team. The project team endeavors to coordinate remediation with third-party stakeholders and is committed to transparency in the disclosure process. The team announces security issues via [GitHub](https://github.com/fastly/compute-sdk-python/releases) on a best-effort basis.
+
+Note that communications related to security issues in Fastly-maintained OSS as described here are distinct from [Fastly Security Advisories](https://www.fastly.com/security-advisories).