common/hexdump: add POSIX page

pages/common/hexdump.md

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+# hexdump
+
+> Display file contents in hexadecimal, decimal, octal, or ASCII.
+> Useful for inspecting dump file, binary data, or debug output.
+> More information: <https://www.unix.com/man_page/osx/1/hexdump/>.
+
+- Print the hexadecimal representation of a file, replacing duplicate lines by `*`:
+
+`hexdump {{path/to/file}}`
+
+- Display the input offset in hexadecimal and its ASCII representation in two columns:
+
+`hexdump -C {{path/to/file}}`
+
+- Display the hexadecimal representation of a file, but interpret only a specific number of bytes of the input:
+
+`hexdump -C -n {{number_of_bytes}} {{path/to/file}}`
+
+- Verbose - no suppression by `*` on duplicate lines:
+
+`hexdump -v {{path/to/file}}`
+
+- Format output using printf-like format string:
+
+`hexdump -e '{{element_format .. end_format}}' {{path/to/file}}`