Add fdupes note

notes/tool/linux/package/fdupes.md

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+---
+title: Fdupes
+man: fdupes
+---
+
+## Usage
+
+Finds duplicate files in a given set of directories.
+
+```shell
+fdupes OPTIONS DIRS
+```
+
+| Option | Description |
+| --- | --- |
+| `-d` `--delete` | Prompt user for files to preserve, deleting all others. |
+| `-r` `--recurse` | For every directory given follow subdirectories encountered within. |
+
+## Example
+
+Search for duplicate files in the current directory:
+
+```shell
+fdupes .
+```