Added previous arduino implementations.

Problem2.cpp

@@ -0,0 +1,19 @@
+#include "Problem2.hpp"
+#include "Arduino.h"
+
+Problem2::Problem2() {
+  input = 4000000;
+}
+
+bool Problem2::Step() {
+  // Sum fibonacci values
+  if ((fibonacci & 0b1) == 0) output += fibonacci;
+
+  // calculate next fibonacci value
+  fibonacci = value1 + value2;
+  value1 = value2;
+  value2 = fibonacci;
+
+  // stop if fibonacci value over max
+  return input < fibonacci;
+}