Create README.md

Author: yole

README.md

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+# Thinkter: A Kotlin Full-stack Application Example
+
+Thinkter is an example of a full-stack Web application built with Kotlin. The backend runs on the JVM, and the browser
+front-end uses React. The example implements a very simple microblogging application.
+
+## Backend
+
+The backend of Thinkter is built using [Ktor](https://github.com/kotlin/ktor), a Web framework built by the Kotlin team.
+For data persistence, it uses [H2](http://www.h2database.com), allowing you to run the example without the need to configure
+an external SQL server. The HTTP server implementation is provided by [Jetty](http://www.eclipse.org/jetty/).
+
+To run the backend, use `./gradlew backend:run`, or open Thinkter as a project in IntelliJ IDEA and execute the shared 
+run configuration `Backend :: Jetty`. This will start serving the REST API of the backend on port 9090.
+
+## Frontend
+
+The frontend of Thinkter is built using [React](https://facebook.github.io/react/). To adapt the React APIs to Kotlin,
+it incorporates a set of [wrappers](https://github.com/orangy/thinkter/tree/master/frontend/src/org/jetbrains/react), which
+you can also use in your projects and adapt to your needs.
+