docs(README.md): add quickstart tutorial [skip-ci]

README.md

@@ -2,3 +2,21 @@
 
 Repository built for integrating Piveau Frontend apps and
 components in the form of a monorepo. 
+
+## Quickstart
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org/en/) (version 18 or higher)
+
+### Running the demo app
+
+```
+cp apps/modules-demo/config/user-config.sample.js apps/modules-demo/config/user-config.js
+npm ci
+npm run dev
+```
+
+## Contributing
+
+Please see [CONTRIBUTING.md](CONTRIBUTING.md) for details.
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