First small rust app - docx template filler

Hello all,

thanks to all the nice people both here in rust forums and in referenced crates (via github questions/issues raised), I managed to glue together fairly trivial rust application.

Aim is to provide a simple tool to generate a batch of DOCX documents from the templates and input data...

Due to my UI framework selection, current build is limited to windows platform.
I do hope to add also other UI implementation to allow Linux/Mac support (i'm linux user as well), with some spare time, when I identify some nicely usable UI crate with support of elementary flexbox or other flow layout...

Code review, comments, suggestions, code quality insults (pun, not implying people are rude here :smiley: quite opposite) etc. more than welcome...