New README

[ethanwharris]

What does this PR do?

Fixes # (issue)

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• Did you write any new necessary tests? [not needed for typos/docs]
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[codecov]

Codecov Report

Merging #756 (a12e217) into master (c06ebce) will increase coverage by 4.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #756      +/-   ##
==========================================
+ Coverage   84.98%   89.07%   +4.09%     
==========================================
  Files         198      198              
  Lines       10681    10693      +12     
==========================================
+ Hits         9077     9525     +448     
+ Misses       1604     1168     -436     

Flag	Coverage Δ
unittests	89.07% <100.00%> (+4.09%)	⬆️

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

Impacted Files	Coverage Δ
flash/core/utilities/imports.py	91.17% <100.00%> (+0.06%)	⬆️
flash/image/classification/transforms.py	93.75% <100.00%> (+3.27%)	⬆️
flash/text/seq2seq/translation/model.py	77.27% <0.00%> (+4.54%)	⬆️
flash/text/seq2seq/summarization/model.py	80.95% <0.00%> (+4.76%)	⬆️
flash/text/seq2seq/core/model.py	77.10% <0.00%> (+9.63%)	⬆️
flash/text/question_answering/finetuning.py	19.78% <0.00%> (+14.28%)	⬆️
flash/text/classification/model.py	93.10% <0.00%> (+22.41%)	⬆️
flash/text/seq2seq/core/data.py	90.24% <0.00%> (+24.39%)	⬆️
flash/text/seq2seq/core/metrics.py	99.07% <0.00%> (+25.00%)	⬆️
flash/text/classification/data.py	91.01% <0.00%> (+28.08%)	⬆️
... and 5 more

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