Create SECURITY.md (#1634)

* Create SECURITY.md

* Update SECURITY.md

Co-authored-by: Joe Pea <[email protected]>

Author: Koooooo-7

Diff for: SECURITY.md

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+# Security Policy
+
+If you believe you have found a security vulnerability in docsify, please report it to us asap.
+
+## Reporting a Vulnerability
+
+**Please do not report security vulnerabilities through our public GitHub issues.**
+
+Send email via :email: [email protected] to us.  
+
+Please include as much of the following information as possible to help us better understand the possible issue:
+
+- Type of issue (e.g. cross-site scripting)
+- 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
+- Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+Thank you in advance.