Add CI/release workflows, artifacthub-pkg.yml, and package.json

- Add .github/workflows/ci.yaml (calls plugin-ci from .github repo)
- Add .github/workflows/release.yaml (calls plugin-release from .github repo)
- Add artifacthub-pkg.yml for ArtifactHub distribution
- Add package.json with headlamp-plugin scripts
- Add README.md

Co-Authored-By: Paperclip <noreply@paperclip.ing>

README.md

@@ -0,0 +1,34 @@
+# headlamp-argocd
+
+A [Headlamp](https://headlamp.dev) plugin for ArgoCD visibility.
+
+Monitors ArgoCD Applications, Rollouts, and health status. Read-only — no cluster write operations.
+
+## Installation
+
+Install via Headlamp's built-in plugin installer (ArtifactHub):
+
+```bash
+# Install from Headlamp UI → Settings → Plugins → Add plugin
+# Search for "argocd" or paste the ArtifactHub URL
+```
+
+## Development
+
+```bash
+npm install
+npm run build
+npm test
+```
+
+## Release
+
+Releases are automated via the GitHub Actions release workflow:
+
+```bash
+gh workflow run Release --field version=0.1.0
+```
+
+## License
+
+Apache-2.0