Clean up repo

[briacht]

Includes:

• Re-organizing and updating main README
• Updating Roadmap
• Adding doc for platform limitations

[codecov]

Codecov Report

Merging #5892 (cc34aa5) into main (526215d) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5892   +/-   ##
=======================================
  Coverage   68.19%   68.19%           
=======================================
  Files        1142     1142           
  Lines      242367   242367           
  Branches    25355    25355           
=======================================
+ Hits       165273   165280    +7     
+ Misses      70409    70407    -2     
+ Partials     6685     6680    -5     

Flag	Coverage Δ
Debug	68.19% <ø> (+<0.01%)	⬆️
production	62.87% <ø> (+<0.01%)	⬆️
test	88.56% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...c/Microsoft.ML.FastTree/Utils/ThreadTaskManager.cs	79.48% <0.00%> (-20.52%)	⬇️
...ML.Transforms/Text/StopWordsRemovingTransformer.cs	86.38% <0.00%> (+0.14%)	⬆️
src/Microsoft.ML.AutoML/Sweepers/Parameters.cs	85.59% <0.00%> (+0.84%)	⬆️
...rosoft.ML.AutoML/ColumnInference/TextFileSample.cs	62.25% <0.00%> (+2.64%)	⬆️
....ML.AutoML/PipelineSuggesters/PipelineSuggester.cs	85.03% <0.00%> (+6.29%)	⬆️

[michaelgsharp]

Just getting back to this now that I am back in town. It looks good to me. Ready to make it a full PR? Or what is left before you do that?

[briacht]

I want to update the roadmap before making it the final draft

[luisquintanilla]

Looks great :)

[briacht]

@michaelgsharp This should be good to go!