add GreenSym

[fsxbhyy]

• Fix interpolation, now available for frequency space (type int matsubara frequency grid)
• Add symmetrized Green's function

[codecov-commenter]

Codecov Report

Merging #26 (94ff7ea) into master (a549f06) will decrease coverage by 17.94%. The diff coverage is 66.32%.

@@             Coverage Diff             @@
##           master      #26       +/-   ##
===========================================
- Coverage   80.74%   62.79%   -17.95%     
===========================================
  Files           2        3        +1     
  Lines         135      293      +158     
===========================================
+ Hits          109      184       +75     
- Misses         26      109       +83     

Impacted Files	Coverage Δ
src/green/Green.jl	56.56% <ø> (-24.78%)	:arrow_down:
src/green/GreenSym.jl	66.32% <66.32%> (ø)

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