Add information on the Julia bindings

[erikscheurer]

The Julia bindings are now released. This PR adds information on installation and uses to the preCICE website.

[MakisH]

Very nice! 😄

I did not install and run, but I could at least trigger the package installation (I would need to switch to preCICE v2.4.0, first, which I don't want to do at the moment). If you want me to also test this, just ask and I will do it.

I only have tiny language suggestions and a couple of minor edits.

Great documentation!

[IshaanDesai]

Looks good, I did not go into super detail as I already refined all of this with @erikscheurer in the original README.

[MakisH]

Looks good, thanks a lot! 😄

Before merging, could you please also describe here in a comment how the Julia bindings would fit in the bindings architecture figure? I can then update this picture in a future PR.

[erikscheurer]

Maybe @IshaanDesai can help me out here, I'm not 100% sure how the architecture fits in here.
With the Julia bindings we make a call to the C library libprecice.so (literally ccall). As far as I can see we have no explicit connection to any C++ header or something, only what the library provides.

[MakisH]

Maybe @IshaanDesai can help me out here, I'm not 100% sure how the architecture fits in here. With the Julia bindings we make a call to the C library libprecice.so (literally ccall). As far as I can see we have no explicit connection to any C++ header or something, only what the library provides.

So, you only link to the library, without including any headers, and use the C interface. This is enough for me to draw it, thanks! 👍

[MakisH]

See #202