add crnn demo

Author: Charles-258

README.md

@@ -83,6 +83,10 @@ Some examples are listed below. You can find more in the directory of each model
 
 ![gsoc](./models/text_detection_db/examples/gsoc.jpg)
 
+### Text Detection with [CRNN](./models/text_recognition_crnn/)
+
+![crnn_demo](./models/text_recognition_crnn/examples/CRNNCTC.gif)
+
 ## License
 
 OpenCV Zoo is licensed under the [Apache 2.0 license](./LICENSE). Please refer to licenses of different models.

models/text_recognition_crnn/README.md

@@ -34,6 +34,12 @@ python demo.py --model text_recognition_CRNN_CN_2021nov.onnx --charset charset_3
 python demo.py --input /path/to/image --model text_recognition_CRNN_CN_2021nov.onnx --charset charset_3944_CN.txt
 ```
 
+### Examples
+
+![CRNNCTC](./examples/CRNNCTC.gif)
+
+![demo](./examples/demo.jpg)
+
 ## License
 
 All files in this directory are licensed under [Apache 2.0 License](./LICENSE).