Add mandoc-manpage for tee(1)

and mark it as done in the README,
as the -i-flag has been added previously.

README

@@ -66,7 +66,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =  sync            non-posix                       none
 =  tail            no                              -c, -f
 =  tar             non-posix                       none
-=  tee             no                              -i
+=  tee             yes                             none
    test            yes                             none
 =  touch           no                              -r
 #* tr              yes                             none

tee.1

@@ -1,17 +1,29 @@
-.TH TEE 1 sbase\-VERSION
+.Dd January 23, 2015
-.SH NAME
+.Dt TEE 1 sbase\-VERSION
-tee \- duplicate stdin
+.Sh NAME
-.SH SYNOPSIS
+.Nm tee
-.B tee
+.Nd duplicate stdin
-.RB [ \-ai ]
+.Sh SYNOPSIS
-.RI [ file ...]
+.Nm tee
-.SH DESCRIPTION
+.Op Fl ai
-.B tee
+.Op Ar file ...
-writes from stdin to stdout, making copies in each file.
+.Sh DESCRIPTION
-.SH OPTIONS
+.Nm
-.TP
+writes from stdin to stdout and each
-.B \-a
+.Ar file .
-append to each file rather than overwriting.
+.Sh OPTIONS
-.TP
+.Bl -tag -width Ds
-.B \-i
+.It Fl a
-ignore SIGINT, i.e. the interrupt from keyboard signal
+Append to each
+.Ar file
+instead of overwriting it.
+.It Fl i
+Ignore SIGINT, see
+.Xr signal 7 .
+.El
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification.