Migrate model card from transformers-repo

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Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/mrm8488/codeBERTaJS/README.md

README.md

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+---
+language: code
+thumbnail:
+---
+
+# CodeBERTaJS
+
+CodeBERTaJS is a RoBERTa-like model trained on the [CodeSearchNet](https://github.blog/2019-09-26-introducing-the-codesearchnet-challenge/) dataset from GitHub for `javaScript` by [Manuel Romero](https://twitter.com/mrm8488)
+
+The **tokenizer** is a Byte-level BPE tokenizer trained on the corpus using Hugging Face `tokenizers`.
+
+Because it is trained on a corpus of code (vs. natural language), it encodes the corpus efficiently (the sequences are between 33% to 50% shorter, compared to the same corpus tokenized by gpt2/roberta).
+
+The (small) **model** is a 6-layer, 84M parameters, RoBERTa-like Transformer model – that’s the same number of layers & heads as DistilBERT – initialized from the default initialization settings and trained from scratch on the full `javascript` corpus (120M after preproccessing) for 2 epochs.
+
+## Quick start: masked language modeling prediction
+
+```python
+JS_CODE = """
+async function createUser(req, <mask>) {
+  if (!validUser(req.body.user)) {
+	  return res.status(400);
+  }
+  user = userService.createUser(req.body.user);
+  return res.json(user);
+}
+""".lstrip()
+```
+
+### Does the model know how to complete simple JS/express like code?
+
+```python
+from transformers import pipeline
+
+fill_mask = pipeline(
+    "fill-mask",
+    model="mrm8488/codeBERTaJS",
+    tokenizer="mrm8488/codeBERTaJS"
+)
+
+fill_mask(JS_CODE)
+
+## Top 5 predictions:
+#
+'res' # prob  0.069489665329
+'next'
+'req'
+'user'
+',req'
+```
+
+### Yes! That was easy 🎉 Let's try with another example
+
+```python
+JS_CODE_= """
+function getKeys(obj) {
+  keys = [];
+  for (var [key, value] of Object.entries(obj)) {
+     keys.push(<mask>);
+  }
+  return keys
+}
+""".lstrip()
+```
+
+Results:
+
+```python
+'obj', 'key', ' value', 'keys', 'i'
+```
+
+> Not so bad! Right token was predicted as second option! 🎉
+
+## This work is heavely inspired on [codeBERTa](https://github.com/huggingface/transformers/blob/master/model_cards/huggingface/CodeBERTa-small-v1/README.md) by huggingface team
+
+<br>
+
+## CodeSearchNet citation
+
+<details>
+
+```bibtex
+@article{husain_codesearchnet_2019,
+	title = {{CodeSearchNet} {Challenge}: {Evaluating} the {State} of {Semantic} {Code} {Search}},
+	shorttitle = {{CodeSearchNet} {Challenge}},
+	url = {http://arxiv.org/abs/1909.09436},
+	urldate = {2020-03-12},
+	journal = {arXiv:1909.09436 [cs, stat]},
+	author = {Husain, Hamel and Wu, Ho-Hsiang and Gazit, Tiferet and Allamanis, Miltiadis and Brockschmidt, Marc},
+	month = sep,
+	year = {2019},
+	note = {arXiv: 1909.09436},
+}
+```
+
+</details>
+
+> Created by [Manuel Romero/@mrm8488](https://twitter.com/mrm8488)
+
+> Made with <span style="color: #e25555;">&hearts;</span> in Spain