Created Windows hashing library.

* Created a sister hasher library for Windows. It targets Windows Vista and later.
* It only supports synchronous IO for now.
Merge branch 'feature/windll' into develop

Created Windows hashing library.

* Created a sister hasher library for Windows. It targets Windows Vista and later.
* It only supports synchronous IO for now.
* Closes #6.

why this merge is necessary,
Merge feature for Windows hasher library.

Closes #6.

* Created a sister hasher library for Windows. It targets Windows Vista and later.
* It only supports synchronous IO for now.