add SECURITY.md (#31)

Author: kingjia90

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you think that you have found a security issue, 
+don’t use the bug tracker and don’t publish it publicly. 
+Instead, all security issues must be reported via a private vulnerability report.
+
+Please follow the [instructions](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability) to submit a private report.
+
+
+## Resolving Process
+Every submitted security issue is handled with top priority by following these steps: 
+
+1. Confirm the vulnerability
+2. Determine the severity
+3. Contact reporter
+4. Work on a patch
+5. Get a CVE identification number (may be done by the reporter or a security service provider)
+6. Patch reviewing 
+7. Tagging a new release for supported versions
+8. Publish security announcement