docs: add README.md

README.md

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+# [Räppli](https://rappli.ch)
+
+[<img height="100" src="./assets/icon-large.png"/>](https://rappli.ch)
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```bash
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+Solid apps are built with _adapters_, which optimise your project for deployment to different environments.
+
+By default, `npm run build` will generate a Node app that you can run with `node build`. To use a different adapter, add it to the `devDependencies` in `package.json` and specify in your `vite.config.js`.
+
+## Powered by solid-start
+
+Everything you need to build a Solid project, powered by [`solid-start`](https://github.com/ryansolid/solid-start/tree/master/packages/solid-start);