Add readme and option to just build via npm

README.md

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+# Airsonic Web Client
+
+This is just meant for exploration. If you want to see something more serious, take a look at [airsonic-ui](https://github.com/airsonic/airsonic-ui).
+
+## Development
+
+The project is written in [ClojureScript](https://clojurescript.org/) and uses [re-frame](https://github.com/Day8/re-frame) for structure and peace of mind. The build tool is [shadow-cljs](https://shadow-cljs.github.io/docs/UsersGuide.html), which offers nice editor integration and interoparibility with the whole JavaScript ecosystem.
+
+To build the project make sure you have Node.js (v6.0.0), npm and Java 8 installed in your system.
+
+```
+# after cloning the project, first install all dependencies
+$ npm install
+# start a continuous build with hot-code-reloading; first build takes a while
+$ npm run dev
+# build and optimize the code once for production
+$ npm run build
+```
+
+**Note:** In dev mode this project comes with re-frame-10x. You can hit `Ctrl + h` to display the overlay and have a time traveling debugger.
+
+## Build artifacts
+
+Everything you need to serve the app can be found inside the `public` folder.