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A README.md

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+# find differences in 2 versions of the same directory
+
+dui _(delete update insert)_ enables you to create multiple indexes of the same directory
+and compare these indexes to get information about new files (inserts), changed files (updates) and deleted files.
+E.g. in a backup scenario one can decide if incremental or full backup is necessary.
+
+## usage
+
+there are basically two modes
+1. create index
+```dui -d /dir/to/index -f /name/of/index.file```
+2. compare index
+```dui -f /name/of/index.file -c /name/of/index2.file```
+Comparison will output a tab-separated list of new, changed, deleted files with their size in bytes.
+```
+insert  /my/data/file   5231
+update  /my/data/file2  100
+update  /my/data/file3  300
+delete  /my/date/file4  2425533
+```
+Using the ```-s```flag the output will be summarized
+```
+insert  1   5231
+update  2   400
+delete  1   2425533
+```