Move repositories to 'repos/' subdirectory

This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.

Issue #1082

repos/hello_tutorial/src/hello/client/main.cc

@@ -0,0 +1,38 @@
+/*
+ * \brief  Test client for the Hello RPC interface
+ * \author Björn Döbel
+ * \date   2008-03-20
+ */
+
+/*
+ * Copyright (C) 2008-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#include <base/env.h>
+#include <base/printf.h>
+#include <hello_session/client.h>
+#include <hello_session/connection.h>
+
+#include <timer_session/connection.h>
+
+using namespace Genode;
+
+int main(void)
+{
+	Hello::Connection h;
+
+	Timer::Connection timer;
+
+	while (1) {
+		h.say_hello();
+
+		int foo = h.add(2, 5);
+		PDBG("Added 2 + 5 = %d", foo);
+		timer.msleep(1000);
+	}
+
+	return 0;
+}