xzdiff: add page (#8923)

pages/common/xzdiff.md

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+# xzdiff
+
+> Invokes the diff command on files compressed with xz, lzma, gzip, bzip2, lzop, or zstd.
+> All options specified are passed directly to diff.
+> More information: <https://manned.org/xzdiff>.
+
+- Compare files:
+
+`xzdiff {{path/to/file1}} {{path/to/file2}}`
+
+- Compare files, showing the differences side by side:
+
+`xzdiff --side-by-side {{path/to/file1}} {{path/to/file2}}`
+
+- Compare files and report only that they differ (no details on what is different):
+
+`xzdiff --brief {{path/to/file1}} {{path/to/file2}}`
+
+- Compare files and report when the files are the same:
+
+`xzdiff --report-identical-files {{path/to/file1}} {{path/to/file2}}`
+
+- Compare files using paginated results:
+
+`xzdiff --paginate {{path/to/file1}} {{path/to/file2}}`
+
+- Compare directories recursively (shows names for differing files/directories as well as changes made to files):
+
+`diff --recursive {{path/to/file1}} {{path/to/file2}}`