Add feature extraction document for luigi

[umursen]

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[codecov-io]

Codecov Report

Merging #103 into velvet-revolution will increase coverage by 0.02%.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##           velvet-revolution    #103      +/-   ##
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+ Coverage              74.87%   74.9%   +0.02%     
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  Files                     56      56              
  Lines                   3495    3495              
====================================================
+ Hits                    2617    2618       +1     
+ Misses                   878     877       -1

Impacted Files	Coverage Δ
modules/ravestate/constraint.py	92.1% <0%> (+0.32%)	⬆️

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[josephbirkner]

Nice summary 👍 Please merge this document (especially the Using the Features-Part) with ravestate_nlp/README.md. Examples would be good, especially for match_either_lemma() and reactions to combined signals. Thoughts @missxa ?

[josephbirkner]

I like it, but it is still missing a "deeper" connection to the docs.

I see the general value of this document as a hands-on tutorial how to approach NLP in connection with a specific use case.

Please:

• ... link it into ravestate_nlp/README.md as Hands on: How to use ravestate_nlp to sell ice cream
• Remove the Extracted Features table. This will just get outdated.