config: add readme for the project

Author: Cezar Sampaio

CHANGELOG.md

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+The MIT License
+
+Copyright (c) 2020, Contentful GmbH
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

LICENSE.md

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-# help-center-marketplace-app
+# Contentful Knowledge Base Template
+
+![Release](https://github.com/cezarsmpio/help-center-gatsby-template/workflows/Release/badge.svg?branch=master)
+
+> A website template for knowledge base apps powered by Contentful.
+
+## Features
+
+- 🔎 Search
+- 🤖 SEO friendly
+- ➡️ Contentful preview
+- 🛠 Netlify ready
+- ⚡️ Performance focused
+- 🦾 Accessibility support
+- 📱 Responsive support
+
+## Pages
+
+- Homepage
+- Categories
+- Article
+- 404 not found
+- Preview articles
+
+![image](https://user-images.githubusercontent.com/954889/82813787-143c4a80-9e96-11ea-84a7-dbe31a1cd26d.png)
+
+## Easiest way to get started
+
+1. Create an account on [contentful.com](https://www.contentful.com/get-started/)
+1. Install the [Knowledge Base App](https://www.contentful.com/marketplace/) from Contentful Marketplace
+1. Done!
+
+## Making changes locally
+
+1. The `.env.example` file contains the environment variables the project needs
+1. Create the `.env.development` and `.env.production` files, one for each environment respectively, and fill up the environment variables
+1. Install the dependencies by running `npm ci`
+1. `npm start`
+
+## Stack
+
+- Gatsby
+- Contentful
+- Netlify
+
+## Support
+
+If you have a problem with this template, please file an issue.
+
+If you have other problems with Contentful not related to this project, you can contact [Customer Support](https://support.contentful.com).
+
+## License
+
+[MIT](MIT.md)