Add a security policy

[zidingz]

Hey there!

I belong to an open source security research community, and a member (@shellinjector) has found an issue, but doesn’t know the best way to disclose it.

If not a hassle, might you kindly add a SECURITY.md file with an email, or another contact method? GitHub recommends this best practice to ensure security issues are responsibly disclosed, and it would serve as a simple instruction for security researchers in the future.

Thank you for your consideration, and I look forward to hearing from you!

(cc @huntr-helper)

[ponelat]

Thank you, created https://github.com/swagger-api/swagger-petstore/pull/72 to address that. For security related issues please send an email to [email protected], thank you!