Add .github/SECURITY.md

Author: enaccess-terraform-authentication[bot]

.github/SECURITY.md

@@ -0,0 +1,5 @@
+# Reporting Security Issues
+
+The EnAcces team and Open Source in Energy Access (OSEA) community take security bugs 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/EnAccess/OpenPAYGO-python/security/advisories/new) tab.