Minimal AGENTS instruction

Ensure automated contributors follow the repository's pull request
template.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

AGENTS.md

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+# Pull requests
+
+When opening a pull request:
+
+- Follow `.github/PULL_REQUEST_TEMPLATE.md` and fill in the applicable sections.
+- Add "Created with: <AGENT NAME>" note at the end of the PR body
+
+## Release note section
+
+If the change is worthy putting in a user-facing release changelog, write a brief entry, ideally one sentence.
+Use present tense and imperative tone.
+Draw inspiration from past release notes: https://docs.docker.com/engine/release-notes/

CLAUDE.md

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+AGENTS.md