Add protobuf-kotlin library.

Minor driveby: Fixed importMaven script in the README per the error received from the deprecated script.

Related to: r.android.com/2295258

Change-Id: I5a0b8fbcd7cab52d8d343b06c59db74d0c61acb9
diff --git a/gradle/README.md b/gradle/README.md
index 232393b..e945e4e 100644
--- a/gradle/README.md
+++ b/gradle/README.md
@@ -4,7 +4,7 @@
 
 ## libs.versions.toml
 
-Keeps track of library and plugin dependencies used by androidx. Adding or updating a library there requires running `./development/importMaven/import_maven_artifacts.py -n myartifact:here:1.0.0`
+Keeps track of library and plugin dependencies used by androidx. Adding or updating a library there requires running `./development/importMaven/importMaven.sh myartifact:here:1.0.0`
 
 ## verification-keyring.keys