Added NLP sample: detect NER

[rajdeepd]

Related issues none

Describe the proposed solution New sample which shows how to extract Person, Organization and Date NER from text

Describe alternatives you've considered none

Additional context There are no NER or NLP related samples

[codecov[bot]]

Codecov Report

Merging #401 into master will decrease coverage by 3.73%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #401      +/-   ##
==========================================
- Coverage   86.82%   83.09%   -3.74%     
==========================================
  Files         336      336              
  Lines       10962    10962              
  Branches      346      556     +210     
==========================================
- Hits         9518     9109     -409     
- Misses       1444     1853     +409

Impacted Files	Coverage Δ
...alesforce/op/cli/gen/templates/SimpleProject.scala	0% <0%> (-100%)	:arrow_down:
.../scala/com/salesforce/op/cli/gen/ProblemKind.scala	0% <0%> (-100%)	:arrow_down:
...cala/com/salesforce/op/cli/gen/FileInProject.scala	0% <0%> (-100%)	:arrow_down:
...in/scala/com/salesforce/op/cli/CommandParser.scala	0% <0%> (-98.12%)	:arrow_down:
...cala/com/salesforce/op/cli/gen/ProblemSchema.scala	0% <0%> (-96.56%)	:arrow_down:
...src/main/scala/com/salesforce/op/cli/gen/Ops.scala	0% <0%> (-94%)	:arrow_down:
...ain/scala/com/salesforce/op/cli/SchemaSource.scala	0% <0%> (-87.94%)	:arrow_down:
...a/com/salesforce/op/cli/gen/ProjectGenerator.scala	0% <0%> (-87.5%)	:arrow_down:
...in/scala/com/salesforce/op/cli/CliParameters.scala	0% <0%> (-80.96%)	:arrow_down:
...src/main/scala/com/salesforce/op/cli/CliExec.scala	0% <0%> (-80%)	:arrow_down:
... and 3 more

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[rajdeepd]

@leahmcguire @Jauntbox please review

[leahmcguire]

@rajdeepd I am not sure we need a notebook to show how to use a single stage. Would you be willing to add it to the examples docs instead? https://github.com/salesforce/TransmogrifAI/blob/master/docs/automl-capabilities/index.md

[rajdeepd]

change to documentation