Add security policy

SECURITY.md

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+This is the Security Policy for the Perl DBD::mysql distribution.
+
+Report security issues via email to Daniël van Eeden <[email protected]>
+or via the
+[private security issue reporting feature in GitHub](https://github.com/perl5-dbi/DBD-mysql/security/advisories/new).
+
+The latest version of the Security Policy can be found in the
+[git repository for DBD::mysql](https://github.com/perl5-dbi/DBD-mysql).
+
+This text is based on the CPAN Security Group's Guidelines for Adding
+a Security Policy to Perl Distributions (version 1.4.1)
+https://security.metacpan.org/docs/guides/security-policy-for-authors.html
+
+# How to Report a Security Vulnerability
+
+Security vulnerabilities can be reported by e-mail to Daniël van Eeden
+at <[email protected]>.
+
+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.
+
+Project maintainers will normally credit the reporter when a
+vulnerability is disclosed or fixed.  If you do not want to be
+credited publicly, please indicate that in your report.
+
+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 or mitigation advice.
+
+For more information, see
+[Report a Security Issue](https://security.metacpan.org/docs/report.html)
+on the CPANSec website.
+
+## Response to Reports
+
+The maintainer(s) aim to acknowledge your security report as soon as
+possible.  However, this project is maintained by a single volunteer in
+their spare time, and they cannot guarantee a rapid response.  If you
+have not received a response from them within a week, 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 maintainer(s) 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 DBD::mysql are covered by this policy.
+
+Security vulnerabilities in versions of any libraries that are
+included in DBD::mysql 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 DBD::mysql, or DBD::mysql can be used to exploit
+vulnerabilities in them.
+
+Security vulnerabilities in downstream software (any software that
+uses DBD::mysql, or plugins to it that are not included with the
+DBD::mysql distribution) are not covered by this policy.
+
+## Supported Versions of DBD::mysql
+
+The maintainer(s) will release security fixes for the latest version
+of DBD::mysql and the v4 branch.
+
+Note that the DBD::mysql project only supports major versions of Perl
+released in the past ten (10) years, even though DBD::mysql will run on
+older versions of Perl.  If a security fix requires the maintainers to
+increase the minimum version of Perl that is supported, then they may
+do so.
+
+# Installation and Usage Issues
+
+The distribution metadata specifies minimum versions of
+prerequisites that are required for DBD::mysql 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.