Add ExistingPortServer to libstratosphere

stratosphere/libstratosphere/include/stratosphere/existingportserver.hpp

@@ -0,0 +1,15 @@
+#pragma once
+#include <switch.h>
+#include "iserver.hpp"
+
+template <typename T>
+class ExistingPortServer : public IServer<T> {    
+    private:
+        virtual Result register_self(const char *service_name) {
+            return 0;
+        }
+    public:
+        ExistingPortServer(Handle port_h, unsigned int max_s) : IServer<T>(NULL, max_s) {
+            this->port_handle = port_h;
+        }
+};