[GR-9403] Improvement of README in terms of outreach.

PullRequest: graal/1034

README.md

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+# [GraalVM](https://graalvm.org/)
+
+GraalVM is an extensive project from [Oracle Labs](https://labs.oracle.com/pls/apex/f?p=LABS:10::::::)
+developing a new JIT Compiler and Polyglot Runtime for the JVM.
+It removes the isolation between programming languages and enables interoperability
+in a high-performance runtime.
+GraalVM includes the following components:
+
+* [Graal SDK](sdk/README.md) contains long term supported APIs of GraalVM.
+
+* [Graal](compiler/README.md) dynamic compiler written in Java that integrates with
+the HotSpot JVM.
+
+* [Truffle](truffle/README.md) framework for implementing languages and instruments
+that use Graal as a dynamic compiler.
+
+* [Tools](tools/README.md) contains a set of tools for Truffle guest languages
+implemented using the instrumentation framework.
+
+* [Substrate VM](substratevm/README.md) framework that allows ahead-of-time (AOT)
+compilation of Java applications under closed-world assumption into executable
+images or shared objects.
+
+* [TRegex](/regex/) is an implementation of regular expressions which leverages Graal and Truffle for efficient compilation of automata.
+
+## Downloads
+GraalVM is available as Community Edition (CE) and Enterprise Edition (EE).
+The current release is based on JDK 8.
+
+GraalVM CE is available for free in development and production use on [GitHub](https://github.com/oracle/graal).
+GraalVM CE open-source binaries are pre-built for Linux OS.
+
+GraalVM EE provides additional performance, security, and scalability relevant
+for running critical applications in production. It is free for use for
+evaluation purposes and available for download from [Oracle Technology Network](http://www.oracle.com/technetwork/oracle-labs/program-languages/downloads/index.html).
+We provide binaries for running GraalVM EE on Linux or Mac OS X on x86 64-bit systems.
+
+## Documentation
+A comprehensive GraalVM documentation can be found [on the website](https://graalvm.org/docs/).  
+It is divided into several sections:
+* [Getting Started](/docs/docs/getting-started/)
+* [Reference Manual](/docs/docs/reference-manual/)
+* [GraalVM as a Platform](/docs/docs/graalvm-as-a-platform/)
+* [FAQ](/docs/docs/faq/)
+* [Effective GraalVM](/docs/docs/effective-graalvm/)
+
+If you can not find the answer you need or have a troubleshooting query,
+[get in touch with us](/docs/ecosystem/).
+
+## Examples
+There are multiply examples [on the website](https://graalvm.org/examples/).
+To demonstrate GraalVM interoperability, let us refer to this tiny example,
+where you access Java from JavaScript code:
+
+```
+$ node --jvm
+> var BigInteger = Java.type('java.math.BigInteger');
+> console.log(BigInteger.valueOf(2).pow(100).toString(16));
+10000000000000000000000000
+```
+The methods in other GraalVM supported languages can be also called with `--polyglot` flag:
+```
+$ node --jvm --polyglot
+> console.log(Polyglot.eval('R', 'runif(100)')[0]);
+0.8198353068437427
+```
+
+## Installing GraalVM
+- Download GraalVM and extract the archive to your file system.
+- Add the GraalVM `/bin` folder to your `PATH` environment variable in order to
+deploy the executables.
+- Optionally set the `JAVA_HOME` environment variable to resolve to the GraalVM
+installation directory.
+You can also specify GraalVM as the JRE or JDK installation in your Java IDE.
+
+## Contributing
+Get acquainted with our [contribution guide](compiler/CONTRIBUTING.md)
+to learn how you can take part in improving Graal.
+Contribute your code or improvements on [GitHub](https://github.com/oracle/graal).
+
+## Code of Conduct
+We adopted a Code of Conduct that we expect project contributors to follow.
+Please read our [Contributor Covenant Code of Conduct](/docs/community/)
+to understand what actions will and will not be tolerated.
+
+## Issues
+Please report bugs or enhancement requests to [GitHub Issues](https://github.com/oracle/graal/issues).
+We listen to input and feedback from the community.
+We cannot give guarantees for issues to be addressed and will make decisions
+whether to address an issue based on the overall project direction.
+Customers using the enterprise edition can report their bugs via the standard
+support channels and according to the service level agreements.
+
+For requests regarding commercial use, please contact
+<a href="mailto:[email protected]">[email protected]</a>.
+
+## License
+GraalVM Community Edition is distributed under a GPLv2 open source license.
+It is free to use in production and comes with no strings attached,
+but also no guarantees or support.
+GraalVM Enterprise Edition is available from the Oracle Technology Network
+under an evaluation license.
+It provides improved performance and security for production deployments.
+Each GraalVM component is licensed:
+[Truffle](/truffle/) and its dependency [Graal SDK](/sdk/) are licensed under
+the [GPL 2 with Classpath exception](truffle/LICENSE.GPL.md)
+[Tools](/tools/) project is licensed under the [GPL 2 with Classpath exception](tools/LICENSE.GPL.md)
+[TRegex](/regex/) project is licensed under the [GPL 2 with Classpath exception](regex/LICENSE.GPL.md).
+The [Graal compiler](/compiler/) is licensed under the [GPL 2](compiler/LICENSE.md)
+[Substrate VM](/substratevm/) is licensed under the [GPL 2](substratevm/LICENSE.md)