message: Fix README
  Fixes
diff: @@ -34,17 +34,18 @@ API consumers use the `DronecodeSDK` class to discover and manage vehicles (`Sys
  The links below take you to the respective header files:
  -- [dronecode_sdk](include/dronecode_sdk.h): set up connection, discover devices
  -- [system](include/system.h): an class representing one drone which can consist of multiple components
  -- [info](plugins/info/info.h): general info about a device
  -- [telemetry](plugins/telemetry/telemetry.h): to receive telemetry data
  -- [action](plugins/action/action.h): to send commands such as arm, disarm, takeoff, land to drone
  -- [mission](plugins/mission/mission.h)/[mission_item](plugins/mission/mission_item.h): to upload a waypoint mission
  -- [offboard](plugins/offboard/offboard.h): for velocity control
  -- [gimbal](plugins/gimbal/gimbal.h): control a gimbal
  -- [camera](plugins/camera/camera.h): capture images, videos, and set camera settings
  -- [follow_me](plugins/follow_me/follow_me.h): drone tracks a position supplied by the Dronecode SDK.
  -- [logging](plugins/logging/logging.h): (not implemented) data logging and streaming from the vehicle.
  +- [dronecode_sdk](core/include/dronecode_sdk.h): set up connection, discover devices
  +- [system](core/include/system.h): an class representing one drone which can consist of multiple components
  +- [info](plugins/info/include/plugins/info/info.h): general info about a device
  +- [telemetry](plugins/telemetry/include/plugins/telemetry/telemetry.h): to receive telemetry data
  +- [action](plugins/action/include/plugins/action/action.h) (and [action_result.h](plugins/action/include/plugins/action/action_result.h)): to send commands such as arm, disarm, takeoff, land to drone
  +- [mission](plugins/mission/include/plugins/mission/mission.h)/[mission_item](plugins/mission/include/plugins/mission/mission_item.h): to upload a waypoint mission
  +- [offboard](plugins/offboard/include/plugins/offboard/offboard.h): for velocity control
  +- [gimbal](plugins/gimbal/include/plugins/gimbal/gimbal.h): control a gimbal
  +- [camera](plugins/camera/include/plugins/camera/camera.h): capture images, videos, and set camera settings
  +- [follow_me](plugins/follow_me/include/plugins/follow_me/follow_me.h): drone tracks a position supplied by the Dronecode SDK.
  +- [calibration](plugins/calibration/include/plugins/calibration/calibration.h): calibrate drone sensors including gyro, accelerometer, and magnetometer.
  +- [logging](plugins/logging/include/plugins/logging/logging.h): (not implemented) data logging and streaming from the vehicle.
  For more information see the [API Overview](https://sdk.dronecode.org/en/#api-overview) in the Dronecode SDK Guide.
  