Add README describing the repo

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

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+# devops
+
+Apps and scripts built as part of the DevOps pipeline for the monoaf.com
+server.
+
+The first pull request adds the deploy pipeline: `deployd`, a webhook
+receiver that releases a repo when a pull request is merged into `main`, and
+the `release` script it runs.