Add pip installation note
Contributed by Gianfranco Di Pietro (https://github.com/GFZ/arosics/pull/37).
Signed-off-by: Daniel Scheffler danschef@gfz-potsdam.de
Edited by Daniel Scheffler
Contributed by Gianfranco Di Pietro (https://github.com/GFZ/arosics/pull/37).
Signed-off-by: Daniel Scheffler danschef@gfz-potsdam.de