feat: add README

Author: henrichter

README.md

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+# Livechat
+
+This repository refactors the archived [k8splay](https://github.com/h3nryc0ding/k8splay) to use [fluxcd](https://github.com/fluxcd/flux2) and [bitnami helm charts](https://github.com/bitnami/charts) as dependencies.
+
+## Features
+
+- [x] GraphQL API
+- [x] SSO Authentication
+- [x] WebSocket based live chat
+
+### Backend
+
+- [x] Reactive Spring Boot with WebFlux and Kotlin
+- [x] Persistence with R2DBC and MongoDB
+- [x] Authentication and Authorization using Keycloak and oAuth2
+- [x] GraphiQL available at `/graphiql`
+
+To run the backend locally, you need to have Jave, Docker, and Docker Compose installed. Start the backend with:
+
+```bash
+cd backend
+make dev
+```
+
+### Frontend
+
+- [x] SvelteKit
+- [x] ShadCN and TailwindCSS for styling
+- [x] Houdini GraphQL client for SSR
+- [x] Authenticated routes
+
+To run the frontend locally, you need to have NodeJS installed. It also expects the backend to be running locally. Start the frontend with:
+
+```bash
+cd frontend
+make dev
+```