Update README.md - add note on non-interactive mode support

Adding a note to readme.md about lack of non-interactive mode support (#20)

Author: pedrour

README.md

@@ -24,6 +24,7 @@ The Security extension adds the `/security:analyze` command to Gemini CLI which
 
 Important: This report is a first-pass analysis, not a complete security audit. Use in combination with other tools and manual review.
 
+Note: The /security:analyze command is currently designed for interactive use. Support for non-interactive sessions is planned for a future release (tracked in issue #20).
 ## GitHub Integration
 
 Coming soon!