Update Contributing guideline for appengine plugins repo (#1042)

Following https://github.com/GoogleContainerTools/jib/blob/master/CONTRIBUTING.md
GoogleCloudPlatform · Jan 9, 2025 · 983767a · 983767a
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+This project is currently stable, and we are primarily focused on critical bug fixes and platform evolution to ensure it continues to work for its supported use cases.
+
 Please follow the guidelines below before opening an issue or a PR:
 
 1. Ensure the issue was not already reported.