Create SECURITY.md

Author: qnikst

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+In this package only the latest major version is generally supported.
+It's possible to add security patches to the older revisions per request.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.0.x   | :white_check_mark: |
+
+## GHC Versions support
+
+| Version | Supported          |
+| ------- | ------------------ |
+|  8.10   | :white_check_mark: |
+|  8.8    | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+For vulnerabilities that should not be disclosured publicily you
+may contact @qnikst. Vulnerability will be reviewed, fixes will
+be published for the lastest major version and affected versions
+that exists in supported stackage LTS snapshots.
+