diffoscope: add page (#4660)

pages/common/diffoscope.md

@@ -0,0 +1,24 @@
+# diffoscope
+
+> Compare files, archives, and directories.
+> More information: <https://diffoscope.org>.
+
+- Compare two files:
+
+`diffoscope {{path/to/file1}} {{path/to/file2}}`
+
+- Compare two files without displaying a progress bar:
+
+`diffoscope --no-progress {{path/to/file1}} {{path/to/file2}}`
+
+- Compare two files and write a HTML-report to a file (use `-` for `stdout`):
+
+`diffoscope --html {{path/to/outfile|-}} {{path/to/file1}} {{path/to/file2}}`
+
+- Compare two directories excluding files with a name matching a specified pattern:
+
+`diffoscope --exclude {{pattern}} {{path/to/directory1}} {{path/to/directory2}}`
+
+- Compare two directories and control whether directory metadata is considered:
+
+`diffoscope --exclude-directory-metadata {{auto|yes|no|recursive}} {{path/to/directory1}} {{path/to/directory2}}`