add bluescreen demo

c_os/user/demo/BlueScreenDemo.h

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