Add some explanations for: floats, tables, and non-ASCII input

It bothered me that the document contained 

- I definitely have to lookup the placement options each time.
-   % Again, I have to look these up. Each. And. Every. Time.

So I added a few lines to explain the most basic options of float positions and tables layout.
It's really not that magical, at least for the basic options (and they are enough, [I wrote a 300 page thesis](https://perso.crans.org/besson/phd.pdf) with almost no need for any other options except the one introduced here)

I also added a last short section about using LaTeX to display non-ASCII symbols (like French ç with \,c) or writing in non-ASCII input.
I think it's mandatory to include this, as most LaTeX users are *not* native English speakers.
I mentioned LuaTeX and XeLaTeX, just to give their names.

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