add one-shoot web win script

win/web.bat

@@ -0,0 +1,20 @@
+if "%1"=="" MAKE.bat demo_collide.c
+
+rem clone emscripten sdk
+if not exist "..\emsdk" (
+	git clone https://github.com/emscripten-core/emsdk ..\emsdk
+	pushd ..\emsdk
+		call emsdk install  3.0.0 && rem latest
+		call emsdk activate 3.0.0 && rem latest
+	popd
+)
+if "%EMSDK%"=="" call ..\emsdk\emsdk_env.bat
+
+rem host webserver, compile and launch
+start python -m http.server --bind 127.0.0.1 8000 --directory build_web
+
+pushd ..
+    emcmake cmake -S . -B build_web -DCMAKE_BUILD_TYPE=Release -DPLATFORM=Web
+    cmake --build build_web --parallel
+    move build_web\eco2d.html build_web\index.html
+popd