Add license section to README

Added licensing information for documentation and usage.

Author: geopayme

README.md

@@ -1,2 +1,9 @@
 # Tri-Modal-Catheter-Lock-TCL
 Tri-Modal Antifungal Catheter Lock (TCL): Proof of Invention Record
+
+## License
+
+- Documentation, LaTeX sources, figures, and PDFs: **Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)**  
+- Commercial use, manufacturing, or distribution requires prior written authorization.  
+  Please contact **[email protected]** for licensing inquiries.
+