Add shoarora/electra and alectra model cards

[shoarora]

Add model cards for recently uploaded models:

• shoarora/electra-small-owt (BERT)
• shoarora/alectra-small-owt (ALBERT)

[codecov-io]

Codecov Report

Merging #3524 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3524      +/-   ##
==========================================
- Coverage   77.80%   77.79%   -0.02%     
==========================================
  Files         100      100              
  Lines       17051    17051              
==========================================
- Hits        13267    13265       -2     
- Misses       3784     3786       +2     

Impacted Files	Coverage Δ
src/transformers/modeling_tf_utils.py	88.15% <0.00%> (-0.18%)	⬇️
src/transformers/modeling_utils.py	91.81% <0.00%> (-0.14%)	⬇️

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[julien-c]

Model pages:
https://huggingface.co/shoarora/alectra-small-owt
https://huggingface.co/shoarora/electra-small-owt

Thanks for sharing @shoarora

Did you see those models btw @LysandreJik?