Change some variable names, add stubs for sensor interface and an implementation

app/include/TemperatureSensor.h

@@ -0,0 +1,9 @@
+#ifndef TEMPERATURESENSOR_H_
+#define TEMPERATURESENSOR_H_
+
+class TemperatureSensor {
+public:
+    virtual int getTemperature() = 0;
+};
+
+#endif // TEMPERATURESENSOR_H_