Man: Add a manpage for rev(1)

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

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+## Name
+
+rev - reverse lines
+
+## Synopsis
+
+```*sh
+$ rev [files...]
+```
+
+## Description
+
+`rev` reads the specified files line by line, and prints them to standard
+output with each line being reversed characterwise. If no files are specifed,
+then `rev` will read from standard input.
+
+## Examples
+
+To print two files 'foo' and 'bar' in reverse:
+```sh
+$ cat foo bar
+foo 1
+foo 2
+bar 1
+bar 2
+$ rev foo bar
+1 oof
+2 oof
+1 rab
+2 rab
+```
+
+To list files with their names in reverse:
+```sh
+$ ls
+foo
+bar
+$ ls | rev
+oof
+rab
+```