implement + enable demos

c_os/user/PCSPKdemo.h

@@ -0,0 +1,19 @@
+#ifndef __PCSPKdemo_INCLUDE_H_
+#define __PCSPKdemo_INCLUDE_H_
+
+#include "kernel/Globals.h"
+#include "kernel/threads/Thread.h"
+
+class PCSPKdemo : public Thread {
+private:
+    PCSPKdemo(const PCSPKdemo& copy) = delete;
+
+public:
+    PCSPKdemo() {
+        kout << "Initialized PCSPKdemo" << endl;
+    }
+
+    void run() override;
+};
+
+#endif