adding content

Start_Linux/timer.c

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+#include <time.h>
+#include "timer.h"
+
+static clock_t startClocks = 0;
+
+// Starts the timer.
+void startTimer()
+{
+    startClocks = clock();
+}
+
+// Returns the time in seconds since startTimer() was called.
+double stopTimer()
+{
+    double measuredSeconds = (clock() - (double)startClocks) / CLOCKS_PER_SEC;
+
+    if(startClocks > 0)
+        startClocks = 0;
+    else
+        measuredSeconds = -1;
+    
+    return measuredSeconds;
+}