Add man pages for zstdgrep and zstdless

programs/zstdless.1

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+.
+.TH "ZSTDLESS" "1" "October 2018" "zstd 1.3.7" "User Commands"
+.
+.SH "NAME"
+\fBzstdless\fR \- view zstandard\-compressed files
+.
+.SH "SYNOPSIS"
+\fBzless\fR [\fIflags\fR] [\fIfile\fR \.\.\.]
+.
+.SH "DESCRIPTION"
+\fBzstdless\fR runs \fBless (1)\fR on files or stdin, if no files argument is given, after decompressing them with \fBzstdcat (1)\fR\.
+.
+.SH "SEE ALSO"
+\fBzstd (1)\fR