adding missing file

src/scripting/src/runtime_lua.cpp

@@ -0,0 +1,22 @@
+#include "runtime_lua.hpp"
+
+namespace pw {
+
+PW_RUNTIME_LUA_USE(core)
+
+runtime_lua &runtime_lua::get()
+{
+	static runtime_lua instance;
+	return instance;
+}
+
+void runtime_lua::add(const std::string &name, runtime_lua::register_function_t f) {
+	_register_function_list[name] = f;
+}
+
+runtime_lua::runtime_lua()
+{
+}
+
+
+}