Update README.md (#6)

README.md

@@ -1,6 +1,12 @@
 # PyGaggle
 
-A gaggle of rerankers for [CovidQA](https://github.com/castorini/pygaggle/blob/master/data/) and CORD-19. 
+[![PyPI](https://img.shields.io/pypi/v/pygaggle?color=brightgreen)](https://pypi.org/project/pygaggle/)
+[![LICENSE](https://img.shields.io/badge/license-Apache-blue.svg?style=flat)](https://www.apache.org/licenses/LICENSE-2.0)
+
+PyGaggle provides a gaggle of deep neural architectures for text ranking and question answering.
+It was designed for tight integration with [Pyserini](http://pyserini.io/), but can be easily adapted for other sources as well.
+
+Currently, this repo contains implementations of the rerankers for [CovidQA](https://github.com/castorini/pygaggle/blob/master/data/) on CORD-19, as described in ["Rapidly Bootstrapping a Question Answering Dataset for COVID-19"](https://arxiv.org/abs/2004.11339).
 
 ## Installation
 
@@ -23,17 +29,36 @@ If this is undesirable, set the environment variable `CORD19_INDEX_PATH` to the
 
 ### Unsupervised Methods
 
-**BM25**: `python -um pygaggle.run.evaluate_kaggle_highlighter --method bm25`
+**BM25**:
+
+```bash
+python -um pygaggle.run.evaluate_kaggle_highlighter --method bm25
+```
 
-**BERT**: `python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name bert-base-cased`
+**BERT**:
 
-**SciBERT**: `python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name allenai/scibert_scivocab_cased`
+```bash
+python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name bert-base-cased
+```
 
-**BioBERT**: `python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name biobert`
+**SciBERT**:
 
+```bash
+python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name allenai/scibert_scivocab_cased
+```
+
+**BioBERT**:
+
+```bash
+python -um pygaggle.run.evaluate_kaggle_highlighter --method transformer --model-name biobert
+```
 
 ### Supervised Methods
 
-**T5 (MARCO)**: `python -um pygaggle.run.evaluate_kaggle_highlighter --method t5`
+**T5 (fine-tuned on MS MARCO)**:
+
+```bash
+python -um pygaggle.run.evaluate_kaggle_highlighter --method t5
+```
 
 Instructions for our other MARCO and SQuAD models coming soon.