Update README.md to mention the license (NO_RELEASE)

craftablescience · web-flow · commit fd71af89b128 · 2025-09-13T14:46:58.000-07:00
diff --git a/README.md b/README.md
@@ -1,2 +1,4 @@
 # P2:CE Addons
 Local addons shipped with Portal 2: Community Edition.
+
+All original content in this repository is licensed under CC0 v1.0.
