add tudouzi board (#85)

* add tudouzi board

* Update Kconfig.projbuild

fix spaces

---------

Co-authored-by: Xiaoxia <terrence@tenclass.com>

main/boards/tudouzi/axp2101.h

@@ -0,0 +1,19 @@
+#ifndef __AXP2101_H__
+#define __AXP2101_H__
+
+#include "i2c_device.h"
+
+class Axp2101 : public I2cDevice {
+public:
+    Axp2101(i2c_master_bus_handle_t i2c_bus, uint8_t addr);
+    bool IsCharging();
+    bool IsDischarging();
+    bool IsChargingDone();
+    int GetBatteryLevel();
+    void PowerOff();
+
+private:
+    int GetBatteryCurrentDirection();
+};
+
+#endif