add Timer class

include/td/misc/Time.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <chrono>
+
+namespace td {
+
+class Timer {
+  private:
+	std::chrono::time_point<std::chrono::system_clock> m_LastTime;
+
+  public:
+	Timer() : m_LastTime(std::chrono::system_clock::now()) {}
+
+	float GetDelta() {
+		auto timeElapsed = std::chrono::system_clock::now() - m_LastTime;
+		float timeSeconds = std::chrono::duration<float, std::chrono::seconds::period>(timeElapsed).count();
+		m_LastTime = std::chrono::system_clock::now();
+		return timeSeconds;
+	}
+};
+
+}  // namespace td