First implementation of the HR sensor using 100% foss code (ported from waspos)

src/components/heartrate/HeartRateController.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cstdint>
+
+namespace Pinetime {
+  namespace Applications {
+    class HeartRateTask;
+  }
+  namespace Controllers {
+    class HeartRateController {
+    public:
+      enum class States { NotEnoughData, NoTouch, Running};
+
+      void Start();
+      void Stop();
+      void Update(States newState, uint8_t heartRate);
+
+      void SetHeartRateTask(Applications::HeartRateTask* task);
+      States State() const { return state; }
+      uint8_t HeartRate() const { return heartRate; }
+
+    private:
+      Applications::HeartRateTask* task = nullptr;
+      States state = States::NotEnoughData;
+      uint8_t heartRate = 0;
+    };
+  }
+}