added codex structure

docs/adr/0000-template.md

@@ -0,0 +1,33 @@
+# ADR-0000: Title
+
+Date: YYYY-MM-DD
+
+Status: Proposed | Accepted | Superseded | Deprecated
+
+## Context
+
+Describe the problem, constraints, assumptions, and relevant background.
+
+## Decision
+
+Describe the decision that has been made.
+
+## Consequences
+
+Describe positive, negative, and neutral consequences.
+
+## Alternatives considered
+
+Describe alternatives and why they were not selected.
+
+## Security impact
+
+Describe security implications, if any.
+
+## Operational impact
+
+Describe deployment, monitoring, rollback, backup, restore, or operational implications, if any.
+
+## Rollback
+
+Describe whether and how this decision can be reverted.