Add inference widget examples

[clmnt]

No description provided.

[codecov]

Codecov Report

Merging #5825 into master will increase coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5825      +/-   ##
==========================================
+ Coverage   78.10%   78.50%   +0.39%     
==========================================
  Files         146      146              
  Lines       26047    26047              
==========================================
+ Hits        20344    20448     +104     
+ Misses       5703     5599     -104     

Impacted Files	Coverage Δ
src/transformers/modeling_tf_roberta.py	43.98% <0.00%> (-49.38%)	⬇️
src/transformers/generation_tf_utils.py	86.21% <0.00%> (+0.25%)	⬆️
src/transformers/modeling_openai.py	82.31% <0.00%> (+1.28%)	⬆️
src/transformers/modeling_tf_openai.py	95.18% <0.00%> (+74.91%)	⬆️

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[sgugger]

LGTM, it's great to add this to the main README!

[LysandreJik]

LGTM