docs: add README

Author: abichinger

README.md

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+# Vue.js Cron
+
+generate cron expressions using Vue.js
+
+This component is inspired by [react-js-cron](https://github.com/xrutayisire/react-js-cron) and [jqcron](https://github.com/arnapou/jqcron)
+
+# Getting Started
+
+Read the [docs](https://abichinger.github.com/vue-js-cron/)
+
+# Packages
+
+This monorepo includes the following packages:
+
+- core - a renderless Vue.js component to generate cron expressions.
+- vuetify - Vuetify component to edit cron expressions.
+- docs - Vue.js Cron documentation with [VuePress](https://vuepress.vuejs.org/)
+
+# Development
+
+## Install dependencies
+```
+yarn install
+```
+
+## Run development server
+```
+yarn dev-core
+yarn dev-vuetify
+yarn dev-docs
+```
+
+## Test
+```
+yarn test
+```
+
+## Build
+```
+yarn build
+```