[Book] Cairo execution artifacts

[Gerson2102]

This the first version of the artifacts docs for the execution.md file. Issue #27

[dmirgaleev]

Hey! Let's try to modify that a little bit, something like that:

1. Page title and general context: add page title (see other doc files for reference) and some words on what we are trying to achieve, e.g. "executing cairo program to obtain execution trace, memory, and AIR inputs"
2. Installation: list everything you need to do before you can run the program
   2.0. Need rust
   2.1. Corelib: I suggest to split the flow in two steps 1) get the cairo repo, it can be already in the system if you have Scarb or you need to clone manually 2) make a symbolic link to the corelib folder (moving is also ok but less preferrable)
   2.2. Cairo1-run: it's better to use cargo install rather than clone the entire repo

[Gerson2102]

@dmirgaleev For the first point. I'm not sure if what I understood is the thing that you meant. I was thinking about a title for the readme, not this:

But I added it anyways.

I put this "executing cairo program to obtain execution trace, memory, and AIR inputs". As the title of the readme.

[Gerson2102]

You shared me this some days ago: https://docs.swmansion.com/scarb/docs/reference/global-directories.html#cache-directory
That is related to the second point that you're talking about. But I dont get the point of doing that. I dont know what should I say about it.

[Gerson2102]

Waiting for all your feedback here mate @dmirgaleev

[Gerson2102]

I think we're done. Let me know sir!
@dmirgaleev

[dmirgaleev]

LGTM