Added security.md file

SECURITY.md

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+# Security
+
+Contentstack takes the security of our software products and services seriously, which includes all source code repositories managed through our GitHub organizations.
+
+If you believe you have found a security vulnerability in any Contentstack-owned repository, please report it to us as described below.
+
+## Reporting Security Issues
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Send email to [[email protected]](mailto:[email protected]).
+
+You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message.
+
+Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
+
+- Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+[https://www.contentstack.com/trust/](https://www.contentstack.com/trust/)