Add pretrain models. (#1522)

fluid/PaddleCV/ocr_recognition/README.md

@@ -197,3 +197,10 @@ env CUDA_VISIBLE_DEVICE=0 python infer.py \
     --model_path="models/model_00044_15000" \
     --input_images_list="data/test.list"
 ```
+
+## 预训练模型
+
+|模型| 错误率|
+|- |:-: |:-:|
+|[ocr_ctc_params](https://drive.google.com/open?id=1gsg2ODO2_F2pswXwW5MXpf8RY8-BMRyZ) | 22.3% |
+|[ocr_attention_params](https://drive.google.com/open?id=1Bx7-94mngyTaMA5kVjzYHDPAdXxOYbRm) | 15.8%|