First you have to install the following dependencies:
nodeNode.js v5.7.0 or laternpmNode Packaged Modules
After installing Node.js you can use the included npm package manager to download all dependencies:
cd src/
npm install
The Gulpfile is located in src/ and can be executed using the npm run compile command.
While developing, you might want to use the following command to automatically build Lychee everytime you save a file:
npm start