add disclaimer

PiperOrigin-RevId: 607871307

README.md

diff --git a/README.md b/README.md
index ff95473..d624fde 100644
--- a/README.md
+++ b/README.md
@@ -91,3 +91,9 @@
 -   Click
     [here](https://issuetracker.google.com/issues/new?component=655104&template=1694023)
     to report any encountered issues.
+
+## Disclaimer
+
+This project is not an official Google project. It is not supported by
+Google and Google specifically disclaims all warranties as to its quality,
+merchantability, or fitness for a particular purpose.