Register short circuit solver

[dalonsoa]

Adds the registry for the short circuit solvers and update docstrings for the short_circuit_pdd function

[codecov[bot]]

Codecov Report

Merging #234 (de18f91) into develop (1f93945) will increase coverage by 0.05%. The diff coverage is 76.62%.

@@             Coverage Diff             @@
##           develop     #234      +/-   ##
===========================================
+ Coverage    46.01%   46.07%   +0.05%     
===========================================
  Files           85       85              
  Lines         9118     9133      +15     
===========================================
+ Hits          4196     4208      +12     
- Misses        4922     4925       +3     

Impacted Files	Coverage Δ
solcore/solar_cell_solver.py	70.80% <37.50%> (-0.27%)	:arrow_down:
...poisson_drift_diffusion/DriftDiffusionUtilities.py	86.16% <78.16%> (-0.31%)	:arrow_down:
solcore/registries.py	100.00% <100.00%> (ø)

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