added CC license

README.md

@@ -29,3 +29,11 @@ The slides for this can be found [here](./slides) liberally borrowing from the m
 
 ## Contact
 Want to reach out, make a comment or otherwise collaborate?  Connect with me kmaull@ucar.edu!
+
+## LICENSE
+
+CC-BY-4.0
+
+![](https://i.creativecommons.org/l/by/4.0/88x31.png)
+
+This work is licensed under a [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).