Added initial interfaces and some sensors implementing them

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/c++/iLight-sample.cxx

@@ -0,0 +1,31 @@
+#include <iostream>
+#include <list>
+
+#include "apds9002.hpp"
+#include "bh1750.hpp"
+#include "max44009.hpp"
+
+using namespace std;
+using namespace upm;
+
+int
+main()
+{
+  list<iLight*> lightSensors;
+
+  // Populate list of light sensors
+  lightSensors.push_back(new APDS9002(0));
+  lightSensors.push_back(new BH1750());
+  lightSensors.push_back(new MAX44009(1));
+
+  // Measure luminance level from all 3 individual sensors
+  for (auto& sensor : lightSensors) {
+    sensor->getLuminance();
+  }
+
+  for (auto& sensor : lightSensors) {
+    delete sensor;
+  }
+
+  return 0;
+}