Adding Indices calculation

[chiaral]

This will try to address issues #13 #14 #15

[codecov-io]

Codecov Report

❌ Patch coverage is 5.81395% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.63%. Comparing base (d7a705c) to head (02a91ef).
⚠️ Report is 85 commits behind head on master.

Files with missing lines	Patch %	Lines
xcape/Indices_calc.py	2.00%	49 Missing ⚠️
xcape/core.py	11.11%	32 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #18       +/-   ##
===========================================
- Coverage   61.78%   48.63%   -13.16%     
===========================================
  Files           7        8        +1     
  Lines         280      366       +86     
  Branches       76       84        +8     
===========================================
+ Hits          173      178        +5     
- Misses         83      164       +81     
  Partials       24       24               

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