update README

README.md

@@ -10,12 +10,18 @@ Make sure that you have a python version >= 3.6. Then install the python package
 pip3 install --user "scipy>=1.4" matplotlib git+https://gitlab.mpcdf.mpg.de/ift/nifty@bb1069ae91a0bca50af3ec49d6c6c5957424e9ae git+https://gitlab.mpcdf.mpg.de/ift/nifty_gridder.git@f1540b9cca161e1aa32aa3cd09a592b3dac5f16b
 ```
 
+The reconstructions start from a common initial configuration (`initial.h5`). It can be generated using the command
+
+```
+python3 movie_start.py
+```
+
 With the following commands start a reconstruction of your favourite example.
 
 ```
-python3 reconstruction.py blobs
-python3 reconstruction.py crescent
-python3 reconstruction.py disk
+python3 reconstruction.py blobs initial.h5
+python3 reconstruction.py crescent initial.h5
+python3 reconstruction.py disk initial.h5
 ```
 
 In order to run the tests you need pytest. Then run: