Add more detail to README & point at the limited docs on the Timetric blog.
Add more detail to README & point at the limited docs on the Timetric blog.

qmssof/sunburnt,anmar/sunburnt,tow/sunburnt,anmar/sunburnt,rlskoeser/sunburnt,pixbuffer/sunburnt-spatial,rlskoeser/sunburnt,pixbuffer/sunburnt-spatial