Rita rust engine

[zaibacu]

• an interface for using rust engine

• some documentation

[codecov]

Codecov Report

Merging #87 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   92.80%   92.82%   +0.02%     
==========================================
  Files          13       13              
  Lines         667      669       +2     
  Branches      115      115              
==========================================
+ Hits          619      621       +2     
  Misses         34       34              
  Partials       14       14              

Impacted Files	Coverage Δ
rita/config.py	91.30% <100.00%> (+0.25%)	⬆️

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