added timer API for easy time tracking

Author: iamsubhranil

timer.c

@@ -0,0 +1,23 @@
+#include <time.h>
+#include "display.h"
+
+static clock_t start = 0, end = 0;
+static const char* runningJob[] = {"Nothing"};
+
+void timer_end(){
+    if(start != 0){
+        end = clock();
+        double sec = (double)(end-start)/CLOCKS_PER_SEC;
+        info("%s finished in %f seconds\n", runningJob[0], sec);
+        start = end = 0;
+        runningJob[0] = "Nothing";
+    }
+}
+
+void timer_start(const char* job){
+    if(start != 0)
+        timer_end();
+    runningJob[0] = job;
+    info("Started %s\n", job);
+    start = clock();
+}

timer.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void timer_start(const char* job);
+void timer_end();