Add BaryCheb

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[codecov-commenter]

Codecov Report

Merging #9 (c7b8929) into master (987976f) will decrease coverage by 2.51%.
The diff coverage is 81.27%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   83.01%   80.50%   -2.52%     
==========================================
  Files           2        3       +1     
  Lines         159      436     +277     
==========================================
+ Hits          132      351     +219     
- Misses         27       85      +58     

Impacted Files	Coverage Δ
src/tree.jl	82.03% <75.86%> (-9.64%)	⬇️
src/basemesh.jl	71.68% <77.64%> (+15.27%)	⬆️
src/barycheb.jl	85.25% <85.25%> (ø)

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