Added timer

src/timer.cpp

@@ -0,0 +1,23 @@
+#include "timer.h"
+
+BEGIN_NAMESPACE
+
+timer::timer() {
+    start_time = std::chrono::system_clock::now();
+    last_lap_time = start_time;
+}
+
+double timer::seconds_since_start() {
+    std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
+    std::chrono::duration<double> elapsed_seconds = now - start_time;
+    return elapsed_seconds.count();
+}
+
+double timer::lap() {
+    std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
+    std::chrono::duration<double> elapsed_seconds = now - last_lap_time;
+    last_lap_time = now;
+    return elapsed_seconds.count();
+}
+
+END_NAMESPACE