Create SECURITY.md

Author: fantix

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+As of Dec 9, 2020:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.x   | :dart: Planned with breaking changes based on 1.4.x and SQLAlchemy 2.0 |
+| 1.4.x   | :building_construction: Actively developing, next major upgrade with SQLAlchemy 1.4 |
+| 1.1.x   | :building_construction: Actively developing, next Stable, 1.1.0-beta2 is released |
+| 1.0.x   | :white_check_mark: Current Stable, security updates only |
+| 0.8.x   | :x: a.k.a. 1.0-beta4, no longer supported since Oct 2020 |
+| < 0.8   | :x: Older versions are not supported |
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to security@python-gino.org.
+You will receive a response from us within 48 hours. If the issue is confirmed,
+we will release a patch as soon as possible depending on complexity.