Added circle_center()
function to compute a center of the circle centrographic geographic profile prediction.
Added /vignettes with examples of package functionality.
Added NEWS.md for entire package history.
Added hex sticker for package.
FUNCTIONS IN INITAL VERSION
cgt_profile()
cmd_pred()
geom_mean_pred()
harm_mean_pred()
linear_profile()
lognorm_profile()
neg_exp_profile()
norm_profile()
trun_neg_exp_profile()