Add maintainer's note to AutofillFramework

The Kotlin version of this sample is temporarily out of date due to
API changes. Add a maintainer's note to let users know that the Java
version is more current at the moment.

It looks like this change was made to Github directly, but will be
wiped out by the next push.

Also, it was a <h1> element, which means the samples parser is
interpreting it as the title of the sample.

Test: N/A
Bug: 73495046
Change-Id: I41e56bcf511b6a238bc32ebbc628d581a8e4e584
diff --git a/input/autofill/AutofillFramework/kotlinApp/README.md b/input/autofill/AutofillFramework/kotlinApp/README.md
index 6040a86..4b58f47 100644
--- a/input/autofill/AutofillFramework/kotlinApp/README.md
+++ b/input/autofill/AutofillFramework/kotlinApp/README.md
@@ -6,6 +6,10 @@
 Activities with views that should be autofilled, and a Service that can provide autofill data to
 client Activities.
 
+Maintainer's Note
+------------------
+**IMPORTANT:** The Kotlin version of this sample is temporarily out of date. Until this is corrected, you should reference the Java version instead.
+
 Introduction
 ------------