Add model readme for bert-base-german-cased
Author: tholor
Pull request: yes
Labels: name: model card

Adding a readme for our German BERT model. Not sure if the file location is correct, as the model was added before model hub / user name spaces were created. 

Comments:
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2799?src=pr&el=h1) Report
> Merging [#2799](https://codecov.io/gh/huggingface/transformers/pull/2799?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/92e974196fc35eb826f64808ae82d20c4380e3eb?src=pr&el=desc) will **increase** coverage by `1.08%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/2799/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/2799?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #2799      +/-   ##
==========================================
+ Coverage   73.95%   75.03%   +1.08%     
==========================================
  Files          93       93              
  Lines       15272    15272              
==========================================
+ Hits        11295    11460     +165     
+ Misses       3977     3812     -165
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/2799?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_openai.py](https://codecov.io/gh/huggingface/transformers/pull/2799/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19vcGVuYWkucHk=) | `81.39% <0%> (+1.32%)` | :arrow_up: |
| [src/transformers/modeling\_ctrl.py](https://codecov.io/gh/huggingface/transformers/pull/2799/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19jdHJsLnB5) | `94.27% <0%> (+2.2%)` | :arrow_up: |
| [src/transformers/modeling\_xlnet.py](https://codecov.io/gh/huggingface/transformers/pull/2799/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ194bG5ldC5weQ==) | `73.21% <0%> (+2.27%)` | :arrow_up: |
| [src/transformers/modeling\_roberta.py](https://codecov.io/gh/huggingface/transformers/pull/2799/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ19yb2JlcnRhLnB5) | `95.77% <0%> (+9.85%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_pytorch\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2799/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9weXRvcmNoX3V0aWxzLnB5) | `89.93% <0%> (+81.2%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/2799?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/2799?src=pr&el=footer). Last update [92e9741...5e0a253](https://codecov.io/gh/huggingface/transformers/pull/2799?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


Location is correct!

There's a small markup issue though (everything is italicized), I'll fix in next commit as it looks like I don't have push access on your fork.

Also will add metadata for language (will tag you in the commit)

Thanks for the fast merge :)
I couldn't find the issue with italics, but it seems that on the [website](https://huggingface.co/bert-base-german-cased) the unordered lists are not correctly rendered from the markdown. Any advice on how to get them correctly formatted there?

Re. the list styling, yes, we'll tweak!