add example line for transform reading

README.md

@@ -97,6 +97,7 @@ read.fs.label()       # read a label file, like `label/lh.cortex.label`
 read.fs.colortable()  # read a color lookup table (LUT), like `$FREESURFER_HOME/FreeSurferColorLUT.txt`
 read.fs.weight()      # read scalar data for a subset of vertices, defined by index. Known as `weight`, `paint` or simply `w` format.
 read.fs.patch()       # read a surface patch, which is a part of a surface.
+read.fs.transform()   # read spatial transformation matrix
 
 write.fs.mgh()        # write data with 1 to 4 dimensions to an MGH format file
 write.fs.curv()       # write a data vector to a 'curv' format file