add man pages for cwebp(1) and dwebp(1)

Change-Id: I450717fc82fff19f16df75aca6a9a567773afd00

man/dwebp.1

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+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH DWEBP 1 "March  1, 2011"
+.SH NAME
+dwebp \- compress a WebP file to an image file
+.SH SYNOPSIS
+.B dwebp
+.RI [ options ] " input_file.webp
+.br
+.SH DESCRIPTION
+This manual page documents the
+.B dwebp
+command.
+.PP
+\fBdwebp\fP decompresses WebP files into PNG or PPM images.
+.SH OPTIONS
+The basic options are:
+.TP
+.B \-h
+Print usage summary.
+.TP
+.B \-o string
+Specify the name of the output file (as PNG format by default).
+.TP
+.B \-ppm
+Change the output format to PPM.
+.TP
+.B \-pgm
+Change the output format to PGM. The output consist of luma/chroma
+samples instead of RGB, using the ICM4 layout. This option is mainly
+for verification and debugging purpose.
+.TP
+.B \-v
+Print extra information (decoding time in particular).
+
+.SH Examples:
+dwebp picture.webp -o output.png
+.br
+dwebp picture.webp -ppm -o output.ppm
+
+.SH
+.SH SEE ALSO
+.BR cwebp (1).
+.br
+Please refer to http://code.google.com/speed/webp/ for additional
+information.
+.SH AUTHOR
+\fBdwebp\fP was written by the WebP team.
+.br
+The latest source tree is available at http://www.webmproject.org/code
+.PP
+This manual page was written by Pascal Massimino <pascal.massimino@gmail.com>,
+for the Debian project (and may be used by others).