updated

README.md

+# Contents of WindEnergyToolbox, [wetb](wetb)
+
+### [hawc2](wetb/hawc2) 
+- [Hawc2io](wetb/hawc2/Hawc2io.py): Read binary, ascii and flex result files
+- [sel_file](wetb/hawc2/sel_file.py): Read/write *.sel (sensor list) files
+
+### [gtsdf](wetb/gtsdf)
+General Time Series Data Format, a binary hdf5 data format for storing time series data.
+- [gtsdf](wetb/gtsdf/gtsdf.py): read/write/append gtsdf files
+- [unix_time](wetb/gtsdf/unix_time.py): convert between datetime and unix time (seconds since 1/1/1970)
+