feat: 🎸 add argocd plugin

argocd/README.md

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+# argocd plugin
+
+[argocd](https://argocdcli.io) plugin for [proto](https://github.com/moonrepo/proto).
+
+## Installation
+
+This is a community plugin and is thus not built-in to proto. In order to use it, first either add it to your global or project-based `.prototools` by running:
+
+### Global install
+
+```shell
+proto plugin add argocd "source:https://raw.githubusercontent.com/appthrust/proto-toml-plugins/main/argocd/plugin.toml" --global
+proto install argocd
+```
+
+### Per-project install
+
+```shell
+proto plugin add argocd "source:https://raw.githubusercontent.com/appthrust/proto-toml-plugins/main/argocd/plugin.toml"
+proto pin argocd latest --resolve
+```

argocd/plugin.toml

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+# A TOML plugin for argocd:
+# https://moonrepo.dev/docs/argocd/plugins#toml-plugin
+
+name = "argocd"
+type = "cli"
+
+[platform.linux]
+download-file = "argocd-linux-{arch}"
+checksum-file = "cli_checksums.txt"
+
+[platform.macos]
+download-file = "argocd-darwin-{arch}"
+checksum-file = "cli_checksums.txt"
+
+[platform.windows]
+download-file = "argocd-windows-{arch}.exe"
+checksum-file = "cli_checksums.txt"
+
+[install]
+download-url = "https://github.com/argoproj/argo-cd/releases/download/v{version}/{download_file}"
+
+[install.arch]
+aarch64 = "arm64"
+x86_64 = "amd64"
+
+[resolve]
+git-url = "https://github.com/argoproj/argo-cd"