Create SECURITY.md

Author: tabacitu

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Updates are provided according to table below.
+
+| Version | Security Updates   |  Feature Updates   |
+| ------- | ------------------ | ------------------ |
+| 3.x.x   | :white_check_mark: | :white_check_mark: |
+| 2.x.x   | :x:                | :x:                |
+| 1.x.x   | :x:                | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover any security related issues, please email cristian.tabacitu@backpackforlaravel.com instead of using the issue tracker.