add Integration module

[gaelforget]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 69.91150% with 34 lines in your changes missing coverage. Please review.

Project coverage is 92.24%. Comparing base (9105671) to head (19bc860).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Integration.jl	69.64%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
- Coverage   93.11%   92.24%   -0.87%     
==========================================
  Files          21       22       +1     
  Lines        2557     2670     +113     
==========================================
+ Hits         2381     2463      +82     
- Misses        176      207      +31     

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