add vector demo

c_os/user/demo/VectorDemo.h

@@ -0,0 +1,20 @@
+#ifndef __VectorDemo_include__
+#define __VectorDemo_include__
+
+#include "kernel/Globals.h"
+#include "kernel/threads/Thread.h"
+#include "user/lib/Vector.h"
+
+class VectorDemo : public Thread {
+private:
+    VectorDemo(const VectorDemo& copy) = delete;
+
+public:
+    VectorDemo() {
+        kout << "Initialized VectorDemo" << endl;
+    }
+
+    void run() override;
+};
+
+#endif