docs: add README and .env.example

Author: danielroe

.env.example

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+NUXT_WEBHOOK_GITHUB_SECRET_KEY=
+NUXT_GITHUB_APP_ID=
+NUXT_GITHUB_PRIVATE_KEY=

README.md

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+# unsight.dev
+
+> Detect duplicate GitHub issues, areas of concern and more across related repositories
+
+<p align="center">
+  <a href="https://unsight.dev/" target="_blank">
+    <img width="1090" alt="Screenshot of unsight.dev showing a cluster of issues on nuxt/nuxt" src="https://github.com/user-attachments/assets/281b5167-eef6-4e08-be50-a6ff047c613b">
+  </a>
+</p>
+
+- [👉 &nbsp;Check it out](https://unsight.dev/)
+
+## ✨ Features
+
+- Built on [Nuxt](https://nuxt.com/)
+- [Nitro server API routes](https://nuxt.com/docs/guide/concepts/server-engine#server-engine)
+- [GitHub API](https://docs.github.com/en/rest) and a [GitHub App](https://docs.github.com/en/apps/creating-github-apps)
+- [UnoCSS](https://unocss.dev/)
+- Deployed on [Cloudflare](https://cloudflare.com/) with [NuxtHub](https://hub.nuxt.com/), using [Workers AI](https://developers.cloudflare.com/workers-ai/#_top), [Workers KV](https://developers.cloudflare.com/kv/#_top) and [Vectorize](http://developers.cloudflare.com/vectorize/)
+
+## 🛝 Try it out locally
+
+You can try the app out locally (for tweaking the UI) using the deployed API.
+
+```
+corepack enable
+pnpm i
+pnpm dev --ui-only
+```
+
+This will fire up a dev server but use the remote API to populate it.
+
+## License
+
+Made with ❤️
+
+Published under [MIT License](./LICENCE).