porting web to emcmake

proj-web/README.md

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+# how to build
+
+
+Activate the environment:
+```
+C:\Work\Projects\emsdk\emsdk.bat activate latest
+C:\Work\Projects\emsdk\emsdk_env.bat
+```
+
+
+Optionally clear cache:
+```
+emcc --clear-cache
+embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image_jpg sdl2_image_png
+```
+
+Build:
+```
+mkdir build
+cd build
+emcmake cmake -G Ninja -DCMAKE_MAKE_PROGRAM="../thirdparty/ninja.exe" ..
+cmake --build .
+```
+
+Optionally install:
+```
+cmake --install .
+```
+
+Run:
+```
+emrun --no_browser --port 8080 public
+```