Add some Http3 skeleton

src/Http3App.h

@@ -0,0 +1,33 @@
+#include "App.h"
+
+#include "Http3Response.h"
+#include "Http3Request.h"
+#include "Http3Context.h"
+
+namespace uWS {
+
+    struct QuicApp {
+        Http3Context *http3Context;
+
+        QuicApp(SocketContextOptions options = {}) {
+            /* Create the http3 context */
+            http3Context = Http3Context::create((us_loop_t *)Loop::get(), options);
+        }
+
+        QuicApp &listen(int port, std::function<void(void *)> cb) {
+            return *this;
+        }
+
+        QuicApp &get(std::string path, std::function<void(Http3Response *, Http3Request *)> cb) {
+            // http3Context->onHttp, internally using httprouter
+
+            return *this;
+        }
+
+        void run() {
+
+        }
+    };
+
+
+}