Update MeshCore.h

src/MeshCore.h

@@ -74,6 +74,8 @@ public:
 
   // Power management interface (boards with power management override these)
   virtual bool isExternalPowered() { return false; }
+  // True while a board can identify an active battery-charging source.
+  virtual bool isChargerActive() { return false; }
   virtual uint16_t getBootVoltage() { return 0; }
   virtual uint32_t getResetReason() const { return 0; }
   virtual const char* getResetReasonString(uint32_t reason) { return "Not available"; }