Coding Style guide

I suggest that we follow this style guide:

https://github.com/basarat/typescript-book/blob/master/docs/styleguide/styleguide.md

In terms of function documentation, where possible use JSDoc conventions e.g.

/**
 * Description
 * @param nameOfParam Description of param
 * @returns Description of return value
 * @example Optional examples to better explain use case
 */
function Add(type annotations here so no need to label in the docstring) {}

With VSCode hovering a function imported from elsewhere will display this docstring and the function definition.