feat(filetype): add pxm

Co-authored-by: zer0-x <zer0-x.7ty50@aleeas.com>
Signed-off-by: Christina Sørensen <christina@cafkafk.com>

src/info/filetype.rs

@@ -108,6 +108,7 @@ impl FileExtensions {
             "pnm",
             "ppm",
             "ps",
+            "pxm",
             "raw",
             "stl",
             "svg",