chore: move frontend files

frontend/README.md

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+# Web frontend for Vikunja
+
+> The todo app to organize your life.
+
+[![Build Status](https://drone.kolaente.de/api/badges/vikunja/frontend/status.svg)](https://drone.kolaente.de/vikunja/frontend)
+[![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](LICENSE)
+[![Download](https://img.shields.io/badge/download-v0.22.1-brightgreen.svg)](https://dl.vikunja.io)
+[![Translation](https://badges.crowdin.net/vikunja/localized.svg)](https://crowdin.com/project/vikunja)
+
+This is the web frontend for Vikunja, written in Vue.js.
+
+Take a look at [our roadmap](https://my.vikunja.cloud/share/UrdhKPqumxDXUbYpEGJLSIyNTwAnbBzVlwdDpRbv/auth) (hosted on Vikunja!) for a list of things we're currently working on!
+
+## Security Reports
+
+If you find any security-related issues you don't want to disclose publicly, please use [the contact information on our website](https://vikunja.io/contact/#security).
+
+## Docker
+
+There is a [docker image available](https://hub.docker.com/r/vikunja/api) with support for http/2 and aggressive caching enabled.
+In order to build it from sources run the command below. (Docker >= v19.03)
+
+```shell
+export DOCKER_BUILDKIT=1
+docker build -t vikunja/frontend .
+```
+
+Refer to [multi-platform documentation](https://docs.docker.com/build/building/multi-platform/) in order to build for different platforms.
+
+## Project setup
+
+```shell
+pnpm install
+```
+
+### Compiles and hot-reloads for development
+
+```shell
+pnpm run serve
+```
+
+### Compiles and minifies for production
+
+```shell
+pnpm run build
+```
+
+### Lints and fixes files
+
+```shell
+pnpm run lint
+```