Update README.md

Author: landofcoder

README.md

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 # magento2-faq-graph-ql
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+![Landofcoder Black Friday Sale Upto 50%](https://landofcoder.com/media/wysiwyg/slideshow/black-friday-2019.png)
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 ###### What is this extension about?
 With Magento 2 FAQ Graphql Extension, you will not need to worry about creating useful and nice FAQ page for your ecommerce website. The extension will help you to set up nice informative & SEO-friendly magento 2 FAQ page. With faq page, your customers will find convenient, easily and quick to resolve common issues.