add arraylist + demo

c_os/user/demo/ArrayListDemo.h

@@ -0,0 +1,23 @@
+#ifndef __ArrayListDemo_include__
+#define __ArrayListDemo_include__
+
+#include "kernel/Globals.h"
+#include "kernel/threads/Thread.h"
+#include "user/lib/ArrayList.h"
+
+class ArrayListDemo : public Thread {
+private:
+    ArrayListDemo(const ArrayListDemo& copy) = delete;
+
+    ArrayList<int> list;
+
+public:
+    ArrayListDemo() {
+        this->list.init();
+        kout << "Initialized ArrayListDemo" << endl;
+    }
+
+    void run() override;
+};
+
+#endif