Create README.md for the model card of GPorTuguese-2 model (Portuguese GPT-2 small)
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=h1) Report
> Merging [#5744](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/838950ee44360ca427f345441502d4e7ab2772b8&el=desc) will **increase** coverage by `1.12%`.
> The diff coverage is `100.00%`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/5744/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #5744      +/-   ##
==========================================
+ Coverage   77.33%   78.45%   +1.12%     
==========================================
  Files         146      146              
  Lines       26055    26047       -8     
==========================================
+ Hits        20149    20436     +287     
+ Misses       5906     5611     -295     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_bart.py](https://codecov.io/gh/huggingface/transformers/pull/5744/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19iYXJ0LnB5) | `95.74% <100.00%> (-0.06%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_distilbert.py](https://codecov.io/gh/huggingface/transformers/pull/5744/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9kaXN0aWxiZXJ0LnB5) | `64.90% <0.00%> (-33.90%)` | :arrow_down: |
| [src/transformers/generation\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5744/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9nZW5lcmF0aW9uX3V0aWxzLnB5) | `97.11% <0.00%> (+0.28%)` | :arrow_up: |
| [src/transformers/generation\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5744/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9nZW5lcmF0aW9uX3RmX3V0aWxzLnB5) | `86.71% <0.00%> (+0.50%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_mobilebert.py](https://codecov.io/gh/huggingface/transformers/pull/5744/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9tb2JpbGViZXJ0LnB5) | `96.77% <0.00%> (+73.38%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=footer). Last update [b2505f7...ae466d5](https://codecov.io/gh/huggingface/transformers/pull/5744?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
