docs: add playground docs

Author: danielroe

playground/README.md

@@ -0,0 +1,38 @@
+This is a quick port of https://github.com/rocicorp/hello-zero to use Vue and Nuxt.
+
+## Run this repo
+
+First, install dependencies:
+
+```sh
+corepack enable
+pnpm i
+```
+
+Next, run docker:
+
+```sh
+pnpm dev:db-up
+```
+
+**In a second terminal**, run the zero cache server:
+
+```sh
+pnpm dev:zero-cache
+```
+
+**In a third terminal**, run the Vite dev server:
+
+```sh
+pnpm dev:ui
+```
+
+## ❤️ Credits
+
+This was based on https://github.com/rocicorp/hello-zero.
+
+## 🏛️ License
+
+Made with ❤️
+
+Published under [MIT License](../LICENCE).