Add mapping logic and serialization for writing

app/include/sensor/HwmonSensor.h

@@ -13,6 +13,8 @@ public:
   int value() override;
   const std::string toString() const override;
 
+  json toJson() const override;
+
 private:
   const sensors_chip_name *mChipName;
   const sensors_feature *mFeature;

app/include/sensor/NvidiaSensor.h

@@ -11,6 +11,8 @@ public:
   int value() override;
 
   const std::string toString() const override;
+
+  json toJson() const override;
 };
 
 #endif // NVIDIASENSOR_H_

app/include/sensor/Sensor.h

@@ -2,8 +2,9 @@
 #define SENSOR_H_
 
 #include <Printable.h>
+#include <Serializable.h>
 
-class Sensor : public Printable {
+class Sensor : public Printable, public Serializable {
 public:
   // Read the current value
   virtual int value() = 0;