[Model] add vsr serials models (#518)

* [Model] add vsr serials models

Signed-off-by: ChaoII <849453582@qq.com>

* [Model] add vsr serials models

Signed-off-by: ChaoII <849453582@qq.com>

* fix build problem

Signed-off-by: ChaoII <849453582@qq.com>

* fix code style

Signed-off-by: ChaoII <849453582@qq.com>

* modify according to review suggestions

Signed-off-by: ChaoII <849453582@qq.com>

* modify vsr trt example

Signed-off-by: ChaoII <849453582@qq.com>

* update sr directory

* fix BindPPSR

* add doxygen comment

* add sr unit test

* update model file url

Signed-off-by: ChaoII <849453582@qq.com>
Co-authored-by: Jason <jiangjiajun@baidu.com>

examples/vision/sr/basicvsr/cpp/README.md

@@ -0,0 +1,74 @@
+# BasicVSR C++部署示例
+
+本目录下提供`infer.cc`快速完成BasicVSR在CPU/GPU，以及GPU上通过TensorRT加速部署的示例。
+
+在部署前，需确认以下两个步骤
+
+- 1. 软硬件环境满足要求，参考[FastDeploy环境要求](../../../../../docs/cn/build_and_install/download_prebuilt_libraries.md)
+- 2. 根据开发环境，下载预编译部署库和samples代码，参考[FastDeploy预编译库](../../../../../docs/cn/build_and_install/download_prebuilt_libraries.md)
+以Linux上BasicVSR推理为例，在本目录执行如下命令即可完成编译测试（如若只需在CPU上部署，可在[Fastdeploy C++预编译库](../../../../../docs/cn/build_and_install/download_prebuilt_libraries.md/CPP_prebuilt_libraries.md)下载CPU推理库）
+
+```bash
+#下载SDK，编译模型examples代码（SDK中包含了examples代码）
+# fastdeploy版本 >= 0.7.0
+wget https://bj.bcebos.com/fastdeploy/release/cpp/fastdeploy-linux-x64-gpu-0.7.0.tgz
+tar xvf fastdeploy-linux-x64-gpu-0.7.0.tgz
+cd fastdeploy-linux-x64-gpu-0.7.0/examples/vision/sr/basicvsr/cpp/
+mkdir build && cd build
+cmake .. -DFASTDEPLOY_INSTALL_DIR=${PWD}/../../../../../../../fastdeploy-linux-x64-gpu-0.7.0
+make -j
+
+# 下载BasicVSR模型文件和测试视频
+wget https://bj.bcebos.com/paddlehub/fastdeploy/BasicVSR_reds_x4.tar
+tar -xvf BasicVSR_reds_x4.tar
+wget https://bj.bcebos.com/paddlehub/fastdeploy/vsr_src.mp4
+
+
+# CPU推理
+./infer_demo BasicVSR_reds_x4 vsr_src.mp4 0 2
+# GPU推理
+./infer_demo BasicVSR_reds_x4 vsr_src.mp4 1 2
+# GPU上TensorRT推理
+./infer_demo BasicVSR_reds_x4 vsr_src.mp4 2 2
+```
+
+以上命令只适用于Linux或MacOS, Windows下SDK的使用方式请参考:  
+- [如何在Windows中使用FastDeploy C++ SDK](../../../../../docs/cn/faq/use_sdk_on_windows.md)
+
+## BasicVSR C++接口
+
+### BasicVSR类
+
+```c++
+fastdeploy::vision::sr::BasicVSR(
+        const string& model_file,
+        const string& params_file = "",
+        const RuntimeOption& runtime_option = RuntimeOption(),
+        const ModelFormat& model_format = ModelFormat::PADDLE)
+```
+
+BasicVSR模型加载和初始化，其中model_file为导出的Paddle模型格式。
+
+**参数**
+
+> * **model_file**(str): 模型文件路径
+> * **params_file**(str): 参数文件路径
+> * **runtime_option**(RuntimeOption): 后端推理配置，默认为None，即采用默认配置
+> * **model_format**(ModelFormat): 模型格式，默认为Paddle格式
+
+#### Predict函数
+
+> ```c++
+> BasicVSR::Predict(std::vector<cv::Mat>& imgs, std::vector<cv::Mat>& results)
+> ```
+>
+> 模型预测接口，输入图像直接输出检测结果。
+>
+> **参数**
+>
+> > * **imgs**: 输入视频帧序列，注意需为HWC，BGR格式
+> > * **results**: 视频超分结果，超分后的视频帧序列
+
+- [模型介绍](../../)
+- [Python部署](../python)
+- [如何切换模型推理后端引擎](../../../../../docs/cn/faq/how_to_change_backend.md)