chore: Adding note for migrated repo (#440)

* chore: Adding note for migrated repo

* Update README.md

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,6 +3,7 @@ name: Bug report
 about: Create a report to help us improve
 
 ---
+This library has moved to [gapic-generator-java/api-common-java](https://github.com/googleapis/gapic-generator-java/tree/main/api-common-java) This repository will be archived in the future. 
 
 Thanks for stopping by to let us know something could be better!
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,6 +3,7 @@ name: Feature request
 about: Suggest an idea for this library
 
 ---
+This library has moved to [gapic-generator-java/api-common-java](https://github.com/googleapis/gapic-generator-java/tree/main/api-common-java) This repository will be archived in the future.
 
 Thanks for stopping by to let us know something could be better!
 

README.md

@@ -3,6 +3,9 @@ API Common for Java
 
 [![Build Status](https://travis-ci.org/googleapis/api-common-java.svg?branch=main)](https://travis-ci.org/googleapis/api-common-java)
 
+🚌 In January 2023, this library has moved to [gapic-generator-java/api-common-java](https://github.com/googleapis/gapic-generator-java/tree/main/api-common-java). This repository will be archived in the future. Future releases will appear in the new repository (https://github.com/googleapis/gapic-generator-java/releases).
+The Maven artifact coordinates (com.google.api:api-common) remain the same.
+
 - [Documentation](https://googleapis.dev/java/api-common/latest/index.html)
 
 API Common for Java is a library for foundational types relating to Google