Update readme.md

data/readme.md

+The measurement dataset is split into two parts --- the rural and the urban subset of the drive-test campaign. 
+
+In each folder, the measurements are bundled on a per-cell basis. 
+
+Each row of a particular .csv file corresponds to a UE measurement and includes the following values:
+*  TA - Timing Advance Measurement (k)
+*  RSRP - The obtained RSRP (reference signal received power) at the measurement location. Intended for baseline comparison with baseline approaches. 
+*  x - Longitude component of distance to BS in EPSG:31287 coordinate system.
+*  y - Latitude component of distance to BS in EPSG:31287 coordinate system.
+*  dist_to_bs - The Euclidian distance to the BS. Can also be obtained from x and y.