Field updates

[lostermann]

Added geometries and electric field functions.

[codecov]

Codecov Report

Merging #22 (9cf2bc5) into master (d24fe67) will decrease coverage by 1.46%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   72.62%   71.15%   -1.47%     
==========================================
  Files          14       14              
  Lines        1282     1432     +150     
==========================================
+ Hits          931     1019      +88     
- Misses        351      413      +62     

Impacted Files	Coverage Δ
src/field.jl	0.00% <0.00%> (ø)
src/geometry.jl	55.26% <0.00%> (-44.74%)	⬇️
src/effective_interaction.jl	99.56% <0.00%> (+0.03%)	⬆️
src/collective_modes.jl	98.63% <0.00%> (+0.14%)	⬆️
src/system.jl	95.00% <0.00%> (+0.55%)	⬆️
src/mpc.jl	66.85% <0.00%> (+0.97%)	⬆️
src/effective_interaction_simple.jl	91.26% <0.00%> (+1.00%)	⬆️
src/interaction.jl	91.48% <0.00%> (+1.24%)	⬆️
... and 5 more

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