very, very simple WP with midi CC out

include/libremidi/backends/emscripten/config.hpp

@@ -0,0 +1,17 @@
+#pragma once
+#include <libremidi/config.hpp>
+
+namespace libremidi
+{
+
+struct emscripten_input_configuration
+{
+};
+struct emscripten_output_configuration
+{
+};
+struct emscripten_observer_configuration
+{
+};
+
+}