Add a Reference for Whiley.

This should work. The syntax seems to be very Python-like. However, because it is a language for the JVM and is heavily influenced by Java there might be some snags with some of the language elements, like comments and variable declaration.

Reference Links:
- [Whiley Group on GitHub](https://github.com/Whiley/)
- [Whiley Compiler](https://github.com/Whiley/WhileyCompiler/)
- [Whiley Code Examples](https://github.com/Whiley/WhileyCompiler/tree/master/examples)