added lesson 04

04_Adv_ImageJ_Macro/04_ImageJ-macro_programming.pptx

04_Adv_ImageJ_Macro/example_code/array_example.ijm

04_Adv_ImageJ_Macro/example_code/arrays.ijm

04_Adv_ImageJ_Macro/example_code/arrays_access.ijm

..._ImageJ_Macro/example_code/arrays_variable_comparison.ijm

04_Adv_ImageJ_Macro/example_code/dialogs.ijm

04_Adv_ImageJ_Macro/example_code/function.ijm

04_Adv_ImageJ_Macro/example_code/overlays.ijm

...dv_ImageJ_Macro/example_code/print_files_in_directory.ijm

04_Adv_ImageJ_Macro/example_code/regions_of_interest.ijm

04_Adv_ImageJ_Macro/example_code/roimanger_overlays.ijm

04_Adv_ImageJ_Macro/example_code/roimanger_tables.ijm