docs: add more .net samples

[serena-ruan]

Summary

Add more samples for .NET

Tests

Rendered website and tested

Dependency changes

None

AB#1888237

[serena-ruan]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

Merging #1570 (ea1fb5b) into master (0febe3c) will decrease coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1570      +/-   ##
==========================================
- Coverage   83.51%   83.30%   -0.22%     
==========================================
  Files         305      298       -7     
  Lines       15776    15641     -135     
  Branches      732      732              
==========================================
- Hits        13175    13029     -146     
- Misses       2601     2612      +11     

Impacted Files	Coverage Δ
...rosoft/azure/synapse/ml/explainers/ImageSHAP.scala	16.66% <0.00%> (-76.67%)	⬇️
.../azure/synapse/ml/param/PythonWrappableParam.scala	66.66% <0.00%> (-8.34%)	⬇️
...ft/azure/synapse/ml/param/JsonEncodableParam.scala	57.14% <0.00%> (-7.15%)	⬇️
...re/src/main/python/synapse/ml/core/schema/Utils.py	67.10% <0.00%> (-5.27%)	⬇️
...soft/azure/synapse/ml/cognitive/TextToSpeech.scala	84.84% <0.00%> (-3.04%)	⬇️
...oft/azure/synapse/ml/cognitive/TextAnalytics.scala	86.25% <0.00%> (-2.68%)	⬇️
.../execution/streaming/continuous/HTTPSourceV2.scala	89.92% <0.00%> (-2.16%)	⬇️
.../azure/synapse/ml/cognitive/TextAnalyticsSDK.scala	86.01% <0.00%> (-1.40%)	⬇️
...ft/azure/synapse/ml/cognitive/FormRecognizer.scala	73.40% <0.00%> (-1.07%)	⬇️
...t/azure/synapse/ml/cognitive/BingImageSearch.scala	89.28% <0.00%> (-0.90%)	⬇️
... and 10 more

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[serena-ruan]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mhamilton723]

What is this additional file for?

[mhamilton723]

Awesome!!!

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).