chore: update readme

Signed-off-by: Ar Rakin <rakinar2@onesoftnet.eu.org>

README.md

@@ -16,3 +16,7 @@ If you host a modified version of this project, you must provide the source code
 version publicly according to this license, and preserve the above copyright notice in the pages,
 and source code comments.
 You may add your own copyright *alongside* with these notices.
+
+### Exceptions
+
+* The logos of SudoBot (in public/ and in src/images/) are licensed under [Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License](https://creativecommons.org/licenses/by-nc-nd/4.0/).