Updating docs for security, fuzz, codeql, gosec

Signed-off-by: Matt Farina <matt@mattfarina.com>

README.md

@@ -18,6 +18,8 @@ If you are looking for a command line tool for version comparisons please see
 
 ## Package Versions
 
+Note, import `github.com/github.com/Masterminds/semver/v3` to use the latest version.
+
 There are three major versions fo the `semver` package.
 
 * 3.x.x is the stable and active version. This version is focused on constraint
@@ -242,3 +244,15 @@ for _, m := range msgs {
 
 If you find an issue or want to contribute please file an [issue](https://github.com/Masterminds/semver/issues)
 or [create a pull request](https://github.com/Masterminds/semver/pulls).
+
+## Security
+
+Security is an important consideration for this project. The project currently
+uses the following tools to help discover security issues:
+
+* [CodeQL](https://github.com/Masterminds/semver)
+* [gosec](https://github.com/securego/gosec)
+* Daily Fuzz testing
+
+If you believe you have found a security vulnerability you can privately disclose
+it through the [GitHub security page](https://github.com/Masterminds/semver/security).

SECURITY.md

@@ -0,0 +1,19 @@
+# Security Policy
+
+## Supported Versions
+
+The following versions of semver are currently supported:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.x     | :white_check_mark: |
+| 2.x     | :x:                |
+| 1.x     | :x:                |
+
+Fixes are only released for the latest minor version in the form of a patch release.
+
+## Reporting a Vulnerability
+
+You can privately disclose a vulnerability through GitHubs
+[private vulnerability reporting](https://github.com/Masterminds/semver/security/advisories)
+mechanism.