add readme

README.md

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+picsort
+=======
+
+Picsort is a small tool that takes a number of pictures from cameras and sorts them
+into folders by year and month.
+It also detects duplicates and sorts them out.
+
+Surpringsingly it also works most video formats, because of `github.com/tajtiattila/metadata`.
+
+usage
+-----
+
+Ask the program for parameters:
+
+```
+picsort --help
+Usage of ./picsort:
+  -directory string
+        path of the source directory
+  -dry-run
+        don't create directories or files (default true)
+  -target string
+        path to the target directory
+  -workers int
+        number of workers to analyze and copy files (default 10)
+```
+
+Take a folder and sort it into a different directory:
+
+```
+picsort --directory sourcedir --target targetdir
+```
+
+With `--dry-run` a log is generated what would be done.
+
+The `--workers` flag starts multiple workers that take over the copying
+and analyzing of metadata for better throughput.