Add README

Author: emilkarl

README.md

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+# homebrew-aboard
+
+Homebrew tap for [`abrd`](https://github.com/Teamtailor/aboard-cli) — the Aboard agent CLI.
+
+## Install
+
+```sh
+brew tap Teamtailor/aboard
+brew install abrd
+```
+
+`brew upgrade abrd` to pick up new versions.
+
+## Platforms
+
+- macOS (Apple Silicon)
+- Linux (x86_64)
+
+Windows users: download the `.exe` directly from a [release](https://github.com/Teamtailor/homebrew-aboard/releases).
+
+## How this tap is maintained
+
+`Formula/abrd.rb` and the release tarballs are both regenerated automatically by the [release workflow](https://github.com/Teamtailor/aboard-cli/blob/main/.github/workflows/release.yml) in `Teamtailor/aboard-cli` whenever a `v*` tag is pushed there. Do not hand-edit the formula — your changes will be overwritten on the next release.
+
+Source code, issues, and contributions: <https://github.com/Teamtailor/aboard-cli>.