Add documentation, config template and ownership files

Author: Manvi-55

.github/workflows/cleanup-old-runs.yaml

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+name: Cleanup old workflow runs
+
+on:
+  schedule:
+    - cron: '0 0 * * 0'  # Run weekly on Sunday at midnight UTC
+  workflow_dispatch:      # Allow manual triggering
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    steps:
+      - name: Delete old workflow runs
+        uses: Mattraks/delete-workflow-runs@v2
+        with:
+          token: ${{ github.token }}
+          repository: ${{ github.repository }}
+          retain_days: 30
+          keep_minimum_runs: 6

CODEOWNERS

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+# CODEOWNERS - Defines maintainers for this CICS sample
+# Docs: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+# Last reviewed: 2026-08
+
+# For members of the team that maintains Java samples, see https://github.com/orgs/cicsdev/teams/cics-java-maintainers
+* @cicsdev/cics-java-maintainers