Added randomize filename

randomize-filename/README.md

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+## Randomize Filename
+
+With this little script you can randomize the names of given files. File extension won't be changed.
+
+
+#### Arguments
+
+The file takes several arguments
+
+`-r` - recursive: If any directory where given while calling this command, all files in it will be renamed recursively.
+
+`-a` - all (the name is a little misleading): Normally directories are not renamed, but with this argument they will.
+
+`-l LENGHT` - lenght: The lenght of the randomized filenames (default is 16). Replace `LENGHT` with the lenght the randomized names should have.
+
+#### Usage
+
+```
+$ randomize-filename.sh -r .
+```