Added initial interfaces and some sensors implementing them

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

src/otp538u/otp538u.cxx

@@ -55,6 +55,11 @@ float OTP538U::ambientTemperature()
     return temp;
 }
 
+float OTP538U::getTemperature()
+{
+    return ambientTemperature();
+}
+
 float OTP538U::objectTemperature()
 {
     float temp = 0;

src/otp538u/otp538u.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <otp538u.h>
+#include <interfaces/iTemperature.hpp>
 
 namespace upm {
 
@@ -73,7 +74,7 @@ namespace upm {
      * @image html otp538u.jpg
      * @snippet otp538u.cxx Interesting
      */
-    class OTP538U {
+    class OTP538U : virtual public iTemperature {
     public:
         /**
          * OTP538U constructor
@@ -96,6 +97,13 @@ namespace upm {
          */
         float ambientTemperature();
 
+        /**
+         * Gets the ambient temperature in Celsius
+         *
+         * @return Ambient temperature
+         */
+        virtual float getTemperature();
+
         /**
          * Gets the object temperature in Celsius
          *