Add an example of calling rust code from the jit

[0xekez]

For example, write a simple print function which can be called from compiled code to print a value.

[jwpjrdev]

How does the puts call work? I see an explanation but a link to some docs or something that explains this in further detail (what other functions are resolved, potential errors, etc.) would be nice.

Edit: my bad, I meant to post this under PR #60

[Cy6er7um]

I created some examples here #71.