add example optimize coupling scheme parameter

[dominik-kern]

The staggered scheme of OGS (currently implemented for the HM-process) comes with a coupling parameter, whose optimal value is a-priori unknown (it depends on sources and boundaries but only negligible on the mesh). This example demonstrates how to find this optimum iteratively. It saves time to find the optimal value of the coupling parameter on a coarse mesh and then use it on finer meshes.

[codecov[bot]]

Codecov Report

Merging #40 (c3d6c68) into master (b6d9364) will decrease coverage by 0.09%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   72.47%   72.37%   -0.10%     
==========================================
  Files          21       21              
  Lines        1275     1278       +3     
==========================================
+ Hits          924      925       +1     
- Misses        351      353       +2     

Impacted Files	Coverage Δ
ogs6py/ogs.py	76.70% <33.33%> (-0.38%)	:arrow_down:

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[dominik-kern]

Something I may do to speedup the pull-request?

[dominik-kern]

Likely this example may not gain much popularity, still a folder in this project seems the canonical place, rather than creating a new repository.