Add from_excel classmethod to Dataset (closing issue #4 )

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Codecov Report

❌ Patch coverage is 18.18182% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.17%. Comparing base (1b2c66a) to head (ee02a6f).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
floweaver/dataset.py	18.18%	9 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   76.79%   76.17%   -0.62%     
==========================================
  Files          18       18              
  Lines        1030     1041      +11     
  Branches      279      280       +1     
==========================================
+ Hits          791      793       +2     
- Misses        194      203       +9     
  Partials       45       45              

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