Create reorganize_nifti_files.md

doc/reorganize_nifti_files.md

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+
+```
+This script searches through a directory for all nifti files and prints
+them to the output screen in such a way that you can easily make a script
+to reorganize your files to BIDS.
+
+You should save the output to a script, edit the script and then execute it.
+
+Use as
+  reorganize_nifti_files -c <command> -o <outputdir> -x <extension> -s <sessionprefix> [inputdir]
+
+Optional arguments
+  -c <command>               command to execute, eg. mv or cp
+  -o <outputdir>             output directory
+  --subjectprefix=<string>   subject prefix (default = ""
+  --sessionprefix=<string>   session prefix (default = "mri"
+  --datatype=<string>        data type, can be anat|func|dwi|fmap (default = "anat"
+```
+