Add codesandbox

README.md

@@ -6,7 +6,7 @@ A portfolio starter for [Gatsby](https://www.gatsbyjs.org/). The target audience
 
 [Demo Website](https://portfolio-emma.netlify.com/)
 
-[![Deploy to Netlify](https://www.netlify.com/img/deploy/button.svg)](https://app.netlify.com/start/deploy?repository=https://github.com/LeKoArts/gatsby-starter-portfolio-emma)
+[![Deploy to Netlify](https://www.netlify.com/img/deploy/button.svg)](https://app.netlify.com/start/deploy?repository=https://github.com/LeKoArts/gatsby-starter-portfolio-emma) [![Edit gatsby-starter-portfolio-emma](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/LekoArts/gatsby-starter-portfolio-emma/tree/master/)
 
 - Full-width grid-layout
 - Large images