Add security meta-doc [skip ci]

samdark · samdark · commit 11385d7939a7 · 2019-12-06T16:58:41.000+03:00
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
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+# Security Policy
+
+Please use the [security issue form](https://www.yiiframework.com/security) to report to us any security issue you find in Yii.
+DO NOT use the issue tracker or discuss it in the public forum as it will cause more damage than help.
+
+Please note that as a non-commerial OpenSource project we are not able to pay bounties at the moment.
