Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We support the latest minor version. 
+For one minor version prior to the latest, pull requests providing patches to fix security vulnerabilities will be accepted. 
+Support for the previous minor version relies completely on community pull requests.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+| 0.2.x   | :warning:          |
+| < 0.2   | :x:                |
+
+## Patching LTS Versions
+
+If you depend on the prior minor version of TypeDoc and want to submit a fix, submit a pull request
+to the `lts` branch. When merged, a new version will be automatically published with your patch.
+
+Be sure to include an update to the version field in `package.json`.
+
+Note: Only pull requests which fix security vulnerabilities will be accepted. Additional features and bug fixes are out of scope for old versions.
+
+## Reporting a Vulnerability
+Since this library is developed with community support, you may create a new issue for reporting any Vulnerability.