Add security policy (#2)

Author: mawassk

SECURITY.md

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+# Security Policy
+Security is very important for Django Ninja API key. Learn more about it below.
+
+## Version
+Only the latest versions of Django Ninja API key are supported.
+
+You are encouraged to write tests for your application and update your Django Ninja API key version frequently after ensuring that your tests are passing. This way you will benefit from the latest features, bug fixes, and **security fixes**.
+
+It's a good practise to pin your dependencies for your application and use a tool like `dependabot` to keep up to date.
+
+## 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.
+
+## Public Discussions
+To limit the potential impacts of a security vulnerability, please restrain from publicly discussing the issue.
+
+--- 
+
+Thanks for your help!