Add security policy

SECURITY.md

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+# Security Policy for the WWW::Mechanize distribution.
+
+This is the Security Policy for WWW::Mechanize.
+
+The latest version of the Security Policy can be found in the
+[git repository for WWW::Mechanize](https://github.com/libwww-perl/WWW-Mechanize/blob/master/SECURITY.md).
+
+This text is based on the CPAN Security Group's Guidelines for Adding
+a Security Policy to Perl Distributions (version 1.3.0)
+https://security.metacpan.org/docs/guides/security-policy-for-authors.html
+
+# How to Report a Security Vulnerability
+
+Security vulnerabilities can be reported to the current WWW::Mechanize
+maintainers by using GitHub's **Report a vulnerability** submission form.
+On the repository's main page, select **Security** tab and then
+click on the button *Report a vulnerability*.
+Direct link: https://github.com/libwww-perl/WWW-Mechanize/security/advisories/new
+
+Please include as many details as possible, including code samples
+or test cases, so that we can reproduce the issue.  Check that your
+report does not expose any sensitive data, such as passwords,
+tokens, or personal information.
+
+If you would like any help with triaging the issue, or if the issue
+is being actively exploited, please copy the report to the CPAN
+Security Group (CPANSec) at <[email protected]>.
+
+Please *do not* use the public issue reporting system on RT or
+GitHub issues for reporting security vulnerabilities.
+
+Please do not disclose the security vulnerability in public forums
+until past any proposed date for public disclosure, or it has been
+made public by the maintainers or CPANSec.  That includes patches or
+pull requests.
+
+For more information, see
+[Report a Security Issue](https://security.metacpan.org/docs/report.html)
+on the CPANSec website.
+
+## Response to Reports
+
+The maintainers aim to acknowledge your security report as soon as
+possible.  However, this project is maintained by people in
+their spare time, and they cannot guarantee a rapid response.  If you
+have not received a response from them within 14 days, then
+please send a reminder to them and copy the report to CPANSec at
+<[email protected]>.
+
+Please note that the initial response to your report will be an
+acknowledgement, with a possible query for more information.  It
+will not necessarily include any fixes for the issue.
+
+The project maintainers may forward this issue to the security
+contacts for other projects where we believe it is relevant.  This
+may include embedded libraries, system libraries, prerequisite
+modules or downstream software that uses this software.
+
+They may also forward this issue to CPANSec.
+
+# Which Software This Policy Applies To
+
+Any security vulnerabilities in WWW::Mechanize are covered by this policy.
+
+Security vulnerabilities in versions of any libraries that are
+included in WWW::Mechanize are also covered by this policy.
+
+Security vulnerabilities are considered anything that allows users
+to execute unauthorised code, access unauthorised resources, or to
+have an adverse impact on accessibility or performance of a system.
+
+Security vulnerabilities in upstream software (prerequisite modules
+or system libraries, or in Perl), are not covered by this policy
+unless they affect WWW::Mechanize, or WWW::Mechanize can
+be used to exploit vulnerabilities in them.
+
+Security vulnerabilities in downstream software (any software that
+uses WWW::Mechanize, or plugins to it that are not included with the
+WWW::Mechanize distribution) are not covered by this policy.
+
+## Supported Versions of WWW::Mechanize
+
+The maintainers will only commit to releasing security fixes for
+the latest version of WWW::Mechanize.
+
+Note that the WWW::Mechanize project only supports major versions of Perl
+starting from v5.8.0.  If a security fix requires us to increase
+the minimum version of Perl that is supported, then we may do so.
+
+# Installation and Usage Issues
+
+The distribution metadata specifies minimum versions of
+prerequisites that are required for WWW::Mechanize to work.  However, some
+of these prerequisites may have security vulnerabilities, and you
+should ensure that you are using up-to-date versions of these
+prerequisites.
+
+Where security vulnerabilities are known, the metadata may indicate
+newer versions as recommended.
+
+## Usage
+
+Please see the software documentation for further information.