WIP - Gentle Introduction to Finite Difference

[ajozefiak]

@chiyahn

[jlperla]

Consider holding off on this for a few days while we change the notation in the SDO.jl docs

[codecov-io]

Codecov Report

Merging #108 into master will decrease coverage by 0.57%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage     100%   99.42%   -0.58%     
==========================================
  Files           4        6       +2     
  Lines          98      174      +76     
==========================================
+ Hits           98      173      +75     
- Misses          0        1       +1

Impacted Files	Coverage Δ
src/operators.jl	100% <0%> (ø)	⬆️
src/basis.jl	100% <0%> (ø)	⬆️
src/utilities/extrapolatetoboundary.jl	83.33% <0%> (ø)
src/extensionoperators.jl	100% <0%> (ø)

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