Implemented basic `Cons` value type and `List` constructor

* `Cons` is a straigth forward type _pair_ containing `car` and `cdr` typedefs
** they may be accessed using `Car` and `Cdr` helper template aliases
** there is no enforcement of _Cons_ structure and type equality whatsoever
*** i.e. similar to Scheme and different from how it is implemented in _ConstList_
* `List` is a recursive variadic helper template for constructing `Cons` value types
** simplifies _Cons_ construction and may be expanded to offer type deduction and built upon to enforce type equality
* added appropriate test cases

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