Add solvers to src code #22
                
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Colleagues of mine and I started using your project to tackle problems in nonlinear solid mechanics. Firstly, thank you for your work! Without your project, I did not see any way of using FEniCSx for my research. This stems from the approach we use for our material models.
Unfortunately, I am not well-versed in the implementations of
dolfinx,ufl.ExternalOperator, andFEMExternalOperator. This commit simply copiessolvers.pyto the source directory and adds necessary imports in__init__.py. I am aware that this might not be the best approach. My intention was to make sure that installingdolfinx-external-operatorenables users to directly use code fromsolvers.py. At least on my end, this works flawlessly.I am using FEniCSx 0.9 with conda. My setup: