docs(security): add SECURITY.md

Author: Splaktar

SECURITY.md

@@ -0,0 +1,20 @@
+# Security Policy
+
+## Supported Versions
+
+| Version     | Supported          | Status                | Comments                             |
+| ----------- | ------------------ | --------------------- | ------------------------------------ |
+| 1.8.x       | :white_check_mark: | Long Term Support     | See [Long Term Support policy][0]    |
+| 1.3.x-1.7.x | :x:                |                       |                                      |
+| 1.2.x       | :warning:          | Security patches only | Last version to provide IE 8 support |
+| <1.2.0      | :x:                |                       |                                      |
+
+## Reporting a Vulnerability
+
+Email us at [security@angularjs.org](mailto:security@angularjs.org) to report any potential security issues in AngularJS.
+
+Please [use the latest AngularJS possible](https://docs.angularjs.org/guide/security#use-the-latest-angularjs-possible)
+and keep in mind the guidance around AngularJS'
+[expression language](https://docs.angularjs.org/guide/security#angularjs-templates-and-expressions).
+
+[0]: https://docs.angularjs.org/misc/version-support-status#long-term-support