Create README.md
Creating README.md file for model on Community contribution.
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=h1) Report
> Merging [#5152](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/5ed94b231269972c59d53bf4134a842c2273e814&el=desc) will **decrease** coverage by `0.38%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/5152/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #5152      +/-   ##
==========================================
- Coverage   78.32%   77.93%   -0.39%     
==========================================
  Files         137      137              
  Lines       23472    23472              
==========================================
- Hits        18385    18294      -91     
- Misses       5087     5178      +91     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/data/processors/squad.py](https://codecov.io/gh/huggingface/transformers/pull/5152/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9kYXRhL3Byb2Nlc3NvcnMvc3F1YWQucHk=) | `28.66% <0.00%> (-28.03%)` | :arrow_down: |
| [src/transformers/tokenization\_bert.py](https://codecov.io/gh/huggingface/transformers/pull/5152/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fYmVydC5weQ==) | `90.45% <0.00%> (-0.83%)` | :arrow_down: |
| [src/transformers/tokenization\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5152/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90b2tlbml6YXRpb25fdXRpbHMucHk=) | `94.81% <0.00%> (-0.38%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=footer). Last update [5ed94b2...9874049](https://codecov.io/gh/huggingface/transformers/pull/5152?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
