Implement a simple function register manager (SysReg)

include/sysreg.h

@@ -0,0 +1,18 @@
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+namespace VoidFrame {
+class SysReg {
+public:
+  std::function<void(void)> *
+  RegisterCallback(const std::string &&name,
+                   std::function<void(void)> &callback);
+  const std::function<void(void)> *GetCallback(std::string &&name);
+  void DeleteCallback(std::string &&name);
+
+private:
+  std::unordered_map<std::string, std::unique_ptr<std::function<void(void)>>>
+      callbacks;
+};
+} // namespace VoidFrame