Lagom: Move this into Meta/

This is more of a meta thing, since it's not seeing active development,
but is just a way for me to build some Serenity parts and include them
in other projects. Move it out of the root to keep things tidy.

Meta/Lagom/SimpleIPCServer.cpp

@@ -0,0 +1,40 @@
+#include <LibCore/CEventLoop.h>
+#include <LibCore/CTimer.h>
+#include <LibCore/CoreIPCServer.h>
+#include <LibCore/CLocalServer.h>
+#include <stdio.h>
+#include "SimpleEndpoint.h"
+
+class SimpleIPCServer final :
+    public IPC::Server::ConnectionNG<SimpleEndpoint>,
+    public SimpleEndpoint {
+
+    C_OBJECT(SimpleIPCServer)
+public:
+    SimpleIPCServer(CLocalSocket& socket, int client_id)
+        : ConnectionNG(*this, socket, client_id)
+    {
+    }
+
+    virtual OwnPtr<Simple::ComputeSumResponse> handle(const Simple::ComputeSum& message)
+    {
+        return make<Simple::ComputeSumResponse>(message.a() + message.b() + message.c());
+    }
+};
+
+int main(int, char**)
+{
+    CEventLoop event_loop;
+
+    unlink("/tmp/simple-ipc");
+    auto server = CLocalServer::construct();
+    server->listen("/tmp/simple-ipc");
+    server->on_ready_to_accept = [&] {
+        auto client_socket = server->accept();
+        ASSERT(client_socket);
+        static int next_client_id = 0;
+        IPC::Server::new_connection_ng_for_client<SimpleIPCServer>(*client_socket, ++next_client_id);
+    };
+
+    return event_loop.exec();
+}