chore: Add SECURITY.md (#14)

SECURITY.md

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+# Reporting Security Issues
+
+The Grit team and community take security bugs in Grit seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+## Reporting a Vulnerability
+
+To report a security issue, please contact us at [[email protected]][1].
+
+The Grit team will send a response indicating the next steps in handling your report. After the initial reply to your report, the security team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+[1]: mailto:[email protected]