Add create_atoms function to LAMMPS.jl

[jmeziere]

It is useful (at least for me) to be able to load atoms directly from Julia to LAMMPS. This pull request provides a wrapper around lammps_create_atoms to easily do this, similar to the create_atoms function in the python interface to LAMMPS.

[Joroks]

Thanks for the PR, this looks great!

One thing I'm not quite sure about, is the handling of datatypes not supported directly by lammps. Up until now we've just restricted the wrapper functions to be called with the correct datatype.

I understand that it would be convenient for the user if we'd just handle the type conversion where needed but I also don't think that it would be too much to ask to have the user do this themselves.

If we ultimately decide on handling the type conversion on our end, we'd have to make this consistent across our other methods as well. I also think that we shouldn't issue warnings in case of a type mismatch but rather just document this behavior in our docstrings.

@vchuravy what's your opinion on this?

[vchuravy]

Yeah I would rather check the DType and then error

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.33%. Comparing base (913e7c3) to head (5d704de).
Report is 5 commits behind head on main.

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##             main      #60       +/-   ##
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+ Coverage   54.56%   72.33%   +17.76%     
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  Files           2        2               
  Lines         449      459       +10     
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+ Hits          245      332       +87     
+ Misses        204      127       -77     

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[Joroks]

@vchuravy could you take a quick look at this before I merge it?

[Joroks]

Please be a bit more thorough when revising your PR.
Testing that your code is working by typing ] test in your REPL is allways a good idea too.

[Joroks]

I think this should now be good to go.