Create my_vector_1st_class

I got the proposal of putting together a c++ library with some functions that my class mates are eager in using(they're kinda lame), but it was mainly my master's proposal so I couldn't refuse her. If it was my choice, I'd have gone with some more complex functions than those, but yeah, again, they had to understand them and not only this, but also the ways the class methods work and things. So this is the version I presented.
It has messages in RO within it, I'll come up with an EN version and also with some comments if any1 is curious about what I did there(don't expect this, tho'). So, enjoy! :)