Add SECURITY.md for Tidelift

Author: atodorov

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| [latest](https://pypi.org/project/pylint-django/) | :heavy_check_mark: |
+
+## Reporting a Vulnerability
+
+In case you have found a security problem with pylint-django *DO NOT* report
+it into GitHub Issues. Instead go to https://tidelift.com/docs/security
+and follow the instructions there.
+
+At least one of the package maintainers ([@atodorov](http://github.com/atodorov))
+is a lifter at Tidelift and will be notified when you report the security
+problem with them!