Add model cards for DeepPavlov models
Sorry about the Cyrillic `с` yesterday.
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/3138?src=pr&el=h1) Report
> Merging [#3138](https://codecov.io/gh/huggingface/transformers/pull/3138?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/e9e6efdc452b74947d40a5a2e8af2fc444c63b5b?src=pr&el=desc) will **decrease** coverage by `0.52%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/3138/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/3138?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #3138      +/-   ##
==========================================
- Coverage   78.35%   77.83%   -0.53%     
==========================================
  Files          98       98              
  Lines       16422    16422              
==========================================
- Hits        12868    12782      -86     
- Misses       3554     3640      +86
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/3138?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/data/processors/squad.py](https://codecov.io/gh/huggingface/transformers/pull/3138/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9kYXRhL3Byb2Nlc3NvcnMvc3F1YWQucHk=) | `28.89% <0%> (-27.6%)` | :arrow_down: |
| [src/transformers/modeling\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/3138/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ191dGlscy5weQ==) | `94.29% <0%> (-0.16%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/3138?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/3138?src=pr&el=footer). Last update [e9e6efd...fe1854d](https://codecov.io/gh/huggingface/transformers/pull/3138?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>You can also add a link to a thumbnail image from the `thumbnail:` attribute of the YAML front matter metadata, if you want.

Thank you!