chore(content): add readme

packages/content/README.md

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+![nuxt-content](https://user-images.githubusercontent.com/904724/80923202-7a93e880-8d82-11ea-8ae1-044ebdc80aac.png)
+
+# @nuxt/content
+
+[![npm version][npm-version-src]][npm-version-href]
+[![npm downloads][npm-downloads-src]][npm-downloads-href]
+[![Github Actions CI][github-actions-ci-src]][github-actions-ci-href]
+[![Codecov][codecov-src]][codecov-href]
+[![License][license-src]][license-href]
+[![lerna](https://img.shields.io/badge/maintained%20with-lerna-cc00ff.svg)](https://lerna.js.org/)
+
+> @nuxt/content lets you write in a content/ directory, acting as Git-based Headless CMS
+
+- [🎲  Play on CodeSandbox](https://codesandbox.io/s/nuxtcontent-demo-l164h?)
+- [🎬  Demonstration videos](https://content.nuxtjs.org/#videos)
+- [✨  Release Notes](https://github.com/nuxt/content/releases)
+- [📖  Read the documentation](https://content.nuxtjs.org)
+
+## Features
+
+- Blazing fast hot reload in development
+- Vue components in Markdown
+- Full-text search
+- Support static site generation with `nuxt generate`
+- Powerful QueryBuilder API (MongoDB like)
+- Syntax highlighting to code blocks in markdown files using PrismJS.
+- Table of contents generation
+- Handles Markdown, CSV, YAML, JSON(5), XML
+- Extend with hooks
+
+[📖 Read the documentation](https://content.nuxtjs.org)
+
+## Development
+
+1. Clone this repository
+2. Install dependencies using `yarn install` or `npm install`
+3. Start development server using `yarn dev` or `npm run dev`
+
+## License
+
+[MIT License](./LICENSE)
+
+<!-- Badges -->
+[npm-version-src]: https://img.shields.io/npm/v/@nuxt/content/latest.svg
+[npm-version-href]: https://npmjs.com/package/@nuxt/content
+
+[npm-downloads-src]: https://img.shields.io/npm/dt/@nuxt/content.svg
+[npm-downloads-href]: https://npmjs.com/package/@nuxt/content
+
+[github-actions-ci-src]: https://github.com/nuxt/content/workflows/ci/badge.svg
+[github-actions-ci-href]: https://github.com/nuxt/content/actions?query=workflow%3Aci
+
+[codecov-src]: https://img.shields.io/codecov/c/github/nuxt/content.svg
+[codecov-href]: https://codecov.io/gh/nuxt/content
+
+[license-src]: https://img.shields.io/npm/l/@nuxt/content.svg
+[license-href]: https://npmjs.com/package/@nuxt/content