isosize: add page (#4522)

pages/linux/isosize.md

@@ -0,0 +1,16 @@
+# isosize
+
+> Display the size of an ISO file.
+> More information: <https://linux.die.net/man/8/isosize>.
+
+- Display the size of an ISO file:
+
+`isosize {{path/to/file.iso}}`
+
+- Diplay the block count and block size of an ISO file:
+
+`isosize --sectors {{path/to/file.iso}}`
+
+- Display the size of an ISO file divided by a given number (only usable when --sectors is not given):
+
+`isosize --divisor={{number}} {{path/to/file.iso}}`