add: man pages!

- written in md converted to troff using pandoc.
    - both to be distributed with source

src/man/stdouterr.md

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+% STDOUTERR(1)
+% Kevin Samuel
+% April 2021
+
+# Name
+
+stdouterr – write to stdout and/or stderr. useful for testing redirections
+
+# Synopsis
+
+**stdouterr** [ **-o** *output_string* | **-t** ] [ **-e** *error_string* | **-r** ]
+
+# Description
+
+**stdouterr** is a simple tool that writes a line to standard output
+and another line to standard error. The aim is to provide a simple
+tool to provide dummy data for redirection to confirm that the
+redirections work as expected.
+
+# Options
+
+**-o** *output_string*
+:	Print *output_string* to stdout instead of the default **This is output**
+
+**-e** *error_string*
+:	Print *error_string* to stderr instead of the default **This an error message**
+
+**-t**
+:	Don't print outpu*t*
+
+**-r**
+:	Don't print erro*r*