🔒️ Add SECURITY.md policy

Author: pboling

SECURITY.md

@@ -0,0 +1,23 @@
+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |
+|---------|-----------|
+| 3.1.x   | ✅         |
+| 3.0.x   | ❌         |
+| 2.x     | ❌         |
+| 1.x     | ❌         |
+| 0.x     | ❌         |
+
+## Reporting a Vulnerability
+
+Peter Boling is the primary maintainer of this gem. Please find a way
+to [contact him directly](https://railsbling.com/contact) to report the issue. Include as much relevant information as
+possible.
+
+If you are interested in support for versions older than the latest release,
+please consider sponsoring the project / maintainer @ https://liberapay.com/pboling/donate,
+or find other sponsorship links in the [README].
+
+[README]: README.md

omniauth-identity.gemspec

@@ -40,6 +40,7 @@ Gem::Specification.new do |spec|
     "CODE_OF_CONDUCT.md",
     "LICENSE",
     "README.md",
+    "SECURITY.md",
   ]
   spec.bindir = "exe"
   spec.require_paths = ["lib"]