Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Sanic releases long term support release once a year in December. LTS releases receive bug and security updates for **24 months**. Interim releases throughout the year occur every three months, and are supported until the subsequent interim release.
+
+| Version | LTS                | Supported          |
+| ------- | ------------------ | ------------------ |
+| 19.6.0  |                    | :white_check_mark: |
+| 19.3.1  |                    | :heavy_check_mark: |
+| 18.12.0 | :heavy_check_mark: | :heavy_check_mark: |
+| 0.8.3   |                    | :x:                |
+| 0.7.0   |                    | :x:                |
+| 0.6.0   |                    | :x:                |
+| 0.5.4   |                    | :x:                |
+| 0.4.1   |                    | :x:                |
+| 0.3.1   |                    | :x:                |
+| 0.2.0   |                    | :x:                |
+| 0.1.9   |                    | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, we ask that you **do not** create an issue on GitHub. Instead, please [send a message to the core-devs](https://community.sanicframework.org/g/core-devs) on the community forums. Once logged in, you can send a message to the core-devs by clicking the message button.
+
+This will help to not publicize the issue until the team can address it and resolve it.