Add webassembly support (#79)

examples/CMakeLists.txt

@@ -1,3 +1,14 @@
 add_subdirectory(component)
 add_subdirectory(dom)
 add_subdirectory(util)
+
+if (EMSCRIPTEN)
+  foreach(file
+      "index.html"
+      "run_webassembly.sh")
+    configure_file(
+      ${CMAKE_CURRENT_SOURCE_DIR}/${file}
+      ${CMAKE_CURRENT_BINARY_DIR}/${file}
+    )
+  endforeach(file)
+endif()