Provide spack package

[BenjaminRodenberg]

@ajaust and I started to work on a spack package on this fork.

[ajaust]

The corresponding pull request can be found here: spack/spack#19558

[ajaust]

See #63 for some patch needed to compile the bindings with Spack.

[ajaust]

The Spack PR has been merged. :)

Update: Maybe we should discuss what to add to the documentation.

[BenjaminRodenberg]

Spack package is documented (https://github.com/precice/python-bindings#using-spack). Closing this issue.