* polish readme

* add example/README.md's english version

* 增加了ocr exampleREADME.md

* 修正了README.md文档, 同时增加了example OCR README.md, 删除了多余的文件

* Update README.md

* modify src and test codes for yolov4

* fix the bug of openmp not be link

* optimize api code of examples

* fix initial var bug

* fix slice op bug

* add yolov4-tiny example codes

* add yolov4-tiny CMakeLists

* fix crnn usage tip

* fix examples/CMakeLists.txt error when opencv not found

* Fix, compile error when enable acl

* update example of acl

* update benchmark

* add a17 out neon

* Fix, bugs of ops

* update readme

* disable work mode 3 in conv arm imp

* add ACL support & demo

* annotation ACL dump_sub_graph

最新版本代码编译后，例程的可执行文件保存在./build/install/bin目录下

* remove debug codes(printf)

* fix initial var bug

* modify src and test codes for yolov4

* recover crop source code

* add yolov4 example code

* add mish ops and yolov4 example code

* modify example/CMakeList.txt and tm_yolov4.cpp

* delete yolov4 demo codes

* rm yolov4 cmakelist.txt

* Update mish.c

regiseter mish op with OP_MISH_NAME

* add sys_free to avoid memory leak

* rm test.jpg for yolov4

* fix coding problems

* add mish arm implement adn fix winograd conv bug

* add div_ps arm32 implement

* add autor description

（1）宏定义应该是书写遗漏，
（2）munmap在代码中未找到对应的mmap函数，这个是否需要注释。

* add tm_yolov4

* release resource

* code error

* pooling sse implement

* add sys_free to avoid memory leak

* rm test.jpg for yolov4

* add tm_openpose

* Update CMakeLists.txt

* Update README.md

基于 Tengine Lite 最新版本，在 examples/README.md 中补充 OpenPose示例运行方式及结果

* Update README.md

* modify src and test codes for yolov4

* recover crop source code

* add yolov4 example code

* add mish ops and yolov4 example code

* modify example/CMakeList.txt and tm_yolov4.cpp

* delete yolov4 demo codes

* rm yolov4 cmakelist.txt

* Update mish.c

* remove unnecessary copy

* combine loop

* add tm_openpose

* Update CMakeLists.txt

* supplement examples doc and fix the default yolov3 thresh

* fix link

* add examples results

* add tm_yolov4 

* add tm_mobilefacenet

* fix bug __fp16 operate error

* clang-format code