Added basic "Read me" file.

Author: boris-spas

README.md

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+# Running GraalJS on stock JDK11
+
+This is a simple maven project that demonstrates how it's possible to run
+[GraalJS](http://www.graalvm.org/docs/reference-manual/languages/js/) on a
+stock JDK11. The application is a simple JavaScript benchmark embedded in a
+Java application which compares performance of GraalJS and Nashorn.
+
+## Pre requirements
+
+- Linux or Mac OS
+- [Maven](https://maven.apache.org)
+- [JDK11](https://jdk.java.net/11/)
+
+## Setup
+
+- Clone this repository
+```
+git clone https://github.com/graalvm/graal-js-jdk11-maven-demo
+```
+
+- Move to the newly cloned directory
+```
+cd graal-js-jdk11-maven-demo
+```
+
+- Make sure that JAVA_HOME is pointed at a JDK11
+```
+export JAVA_HOME=/path/to/jdk11
+```
+
+- Package the project using Maven
+```
+mvn package
+```
+
+## Execution
+
+This project provides two execution setups (using the
+[exec-maven-plugin](https://www.mojohaus.org/exec-maven-plugin/)). One uses the
+Graal compiler to JIT compile JavaScript for better performance, and the other
+does not and only interprets the JavaScript code. Both executions output
+benchmark results for GraalJS (via the [GraalVM Polyglot
+API](https://www.graalvm.org/truffle/javadoc/index.html?com/oracle/truffle/api/instrumentation/EventContext.html)
+and the [Java Scripting
+API](https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_guide/api.html)) and Nashorn.
+
+
+
+To Execute with Graal run
+```
+mvn exec:exec@graal
+```
+
+To Execute without Graal run
+```
+mvn exec:exec@nograal
+```