Base: Add a man-page for cmp(1)

Base/usr/share/man/man1/cmp.md

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+## Name
+
+cmp - compare files
+
+## Synopsis
+
+```**sh
+$ cmp [options...] file1 file2
+```
+
+## Description
+
+Compare two files and report the location of any differences. By default, execution stops after the first difference, but this can be overridden (see `--verbose` option). Byte and line numbers start at 1. 
+
+## Options
+
+* `--help`: Display help message and exit
+* `-l`, `--verbose`: Output the byte number, and the differing bytes, for every difference.
+* `-s`, `--silent`: Silence output.
+
+## Arguments
+
+* `file1` and `file2`: Files to compare. Use `-` as the file name to read from standard input.
+
+## Exit status
+
+* 0 - Files are identical.
+* 1 - Files are different.
+* 2 - An error occurred.