chore: add security report

SECURITY.md

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+# Security Policy
+
+Security is very important for Jina AI and its community. 
+
+## Supported Versions
+
+The latest versions of Jina are supported.
+
+All Docker images of Jina are scanned with Snyk. [You can find the report here](https://hub.docker.com/repository/docker/jinaai/jina).
+
+<img width="811" alt="image" src="https://user-images.githubusercontent.com/2041322/186850148-62b9bea2-dba2-45e1-80c2-94b5f8cbc553.png">
+
+
+## Reporting a Vulnerability
+
+If you think you found a vulnerability, and even if you are not sure about it, please report it right away by sending an email to: [email protected]. Please try to be as explicit as possible, describing all the steps and example code to reproduce the security issue.
+
+Our team will review it thoroughly and get back to you.
+
+Please restrain from publicly discussing a potential security vulnerability on Github issues or in Slack community. 🙊 It's better to discuss privately and try to find a solution first, to limit the potential impact as much as possible.