init - 初始化项目

platforms/js/README.md

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+Building OpenCV.js by Emscripten
+====================
+
+[Download and install Emscripten](https://emscripten.org/docs/getting_started/downloads.html).
+
+Execute `build_js.py` script:
+```
+emcmake python <opencv_src_dir>/platforms/js/build_js.py <build_dir>
+```
+
+If everything is fine, a few minutes later you will get `<build_dir>/bin/opencv.js`. You can add this into your web pages.
+
+Find out more build options by `-h` switch.
+
+For detailed build tutorial, check out `<opencv_src_dir>/doc/js_tutorials/js_setup/js_setup/js_setup.markdown`.