Added AppSeed App Generator to the list (reactjs#2030)

AppSeed is a FullStack Web App Generator that allows you to choose a visual theme and apply it on a full, but flexible, technology stack in just a few minutes. The app generator can be used without an account. Read more: https://AppSeed.us

content/community/tools-starter-kits.md

@@ -36,3 +36,4 @@ Ready to grow boilerplate with react-router, redux, saga, webpack 3, jest w/ cov
  * **[EDGE Platform](https://github.com/sebastian-software/edge)** Universal React/SSR + Apollo GraphQL + JS/CSS Code Splitting + Fine-Tuned Webpack + Localization/Internationalization. Most things are external dependencies. Boilerplate available.
  * **[bae](https://github.com/siddharthkp/bae)** Zero config toolkit. SSR (with data fetching) + routing + streaming + styling (with styled-components) + HMR out of the box.
  * **[breko-hub](https://github.com/tomatau/breko-hub)** A production ready boilerplate for universal react applications. Complete with code splitting, server render (using koa), redux, sagas, debugging, hot-reloading (live updates on the server), css-modules, scss, super fast integration tests and unit tests. There's also a big focus on clean code and smaller files.
+ * **[appseed](https://github.com/rosoftdeveloper/appseed)** A production ready boilerplate for UI-Ready react applications. The frontend can be bundled with various backends: Flask, Laravel, Express.