added python script for derivation of initial wind covariance matrix
added python script for derivation of initial wind covariance matrix

Signed-off-by: RomanBapst <019237760eff64d50a7eec108f84e3d8840aac17@gmail.com>

PX4/ecl,PX4/ecl,PX4/ecl,PX4/ecl,PX4/ecl