json create

[oladipo123]

hello ,author,After collecting data through my own phone, I want to know how to generate the corresponding JSON file,include - gyro_integration_error
- grv_ori_error
- ekf_ori_error
t_imu = t_tango - tango_reference_time + imu_reference_time + imu_time_offset
- imu_reference_time : approx. time alignments (nanoseconds)
- tango_reference_time : approx. time alignments (nanoseconds)
- imu_time_offset: : fine tuned time alignments (seconds)