Add simple pretrained model: oracat/bert-paper-classifier-arxiv

This model predicts arXiv taxonomy: https://arxiv.org/category_taxonomy.
Link to model: https://huggingface.co/oracat/bert-paper-classifier-arxiv.

src/category_classification/models/oracat__bert_paper_classifier_arxiv/model.py

@@ -0,0 +1,14 @@
+from transformers import pipeline
+
+name = "oracat/bert-paper-classifier-arxiv"
+
+
+class BertPaperClassifierArxivModel:
+    def __init__(self):
+        self.pipeline = pipeline("text-classification", model=name)
+
+    def __call__(self, input):
+        return self.pipeline(input.title + ' ' + input.abstract)
+
+def get_model():
+    return BertPaperClassifierArxivModel()