Support Syntax Highlighting for Solidity

**Solidity** is a programming language designed for developing smart contracts that run on **Ethereum** blockchain.

It would be great for this project to have **syntax highlighting** support for Solidity.
Here is the [Solidity extension repo](https://github.com/juanfranblanco/vscode-solidity) for VS code and here's the [json syntax file](https://github.com/juanfranblanco/vscode-solidity/blob/master/syntaxes/solidity.json).

Additionally, if you want me to do this, I'm up for adding this feature.