Add documentation for CSFs

[mortenpi]

Also includes a small theory section. Still somewhat WIP, but could use another set of eyes.

Close #48.

[codecov[bot]]

Codecov Report

Merging #61 into master will decrease coverage by 1.7%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   90.97%   89.26%   -1.71%     
==========================================
  Files          17       17              
  Lines         842      829      -13     
==========================================
- Hits          766      740      -26     
- Misses         76       89      +13

Impacted Files	Coverage Δ
src/csfs.jl	46.42% <ø> (-2.7%)	:arrow_down:
src/levels.jl	76.19% <0%> (-19.05%)	:arrow_down:
src/allchoices.jl	83.33% <0%> (-8.34%)	:arrow_down:
src/terms.jl	92% <0%> (-6.69%)	:arrow_down:
src/parity.jl	88.23% <0%> (-5.89%)	:arrow_down:
src/spin_orbitals.jl	69.69% <0%> (-3.04%)	:arrow_down:
src/couple_terms.jl	91.3% <0%> (-0.7%)	:arrow_down:
src/jj2lsj.jl	89.36% <0%> (-0.64%)	:arrow_down:
src/xu2006.jl	93.75% <0%> (-0.37%)	:arrow_down:
... and 4 more

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[jagot]

I did not notice until now that the illustration was hand drawn...

[mortenpi]

I did not notice until now that the illustration was hand drawn...

Just a placeholder at the moment. Should probably be replaced before merging. :stuck_out_tongue:

[jagot]

Thanks!