Create SECURITY.md (#1024)

docs/SECURITY.md

@@ -0,0 +1,9 @@
+# Reporting Security Issues
+
+The lichess-bot team and community take security bugs in lichess-bot seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/lichess-bot-devs/lichess-bot/security/advisories/new) tab.
+
+The lichess-bot team will send a response indicating the next steps in handling your report. After the initial reply to your report, the team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+Report security bugs in third-party modules to the person or team maintaining the module.