Guide on adding a new model, animation, and creature to HoMMV

@**footman**, sharing knowledge with fellow members of the Heroes community is a significant gesture; don't hesitate to do it, but do so when you have the opportunity and desire. Years, and even decades, may pass, and people passionate about Heroes will remember you! I am confident that with its current achievements, Heroes of Might and Magic V has every chance of remaining as popular as the legendary Heroes of Might and Magic III!