Add man pages

Signed-off-by: Mattias Andrée <maandree@kth.se>

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+.TH RTGRPBLIB_CREATE_RASTER 3 LIBRIFUNKTIONSTECKENSNITTSGLYFRASTERISERINGSPROGRAMBIBLIOTEKET
+.SH NAME
+rtgrpblib_create_raster - Create a drawing buffer
+
+.SH DESCRIPTION
+.LP
+.nf
+#include <librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket.h>
+
+typedef struct rtgrpblib_raster RTGRPBLIB_RASTER;
+
+RTGRPBLIB_RASTER *rtgrpblib_create_raster(size_t \fIwidth\fP, size_t \fIheight\fP);
+.fi
+.PP
+Link with
+.IR "-lrifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket" .
+
+.SH DESCRIPTION
+The
+.BR rtgrpblib_create_raster ()
+function creates a buffer, with configurations, that the
+library's drawing functions can draw curves in, which the
+.BR rtgrpblib_fill_shapes (3)
+function can ultimately process to generate a image.
+.PP
+The created buffer will be
+.I width
+cells wide, and
+.I height
+cells tall.
+.PP
+The returned object can be deallocated using the
+.BR free (3)
+function, it can also be reinitialised and reshaped
+using the
+.BR rtgrpblib_reset_raster (3)
+function.
+
+.SH RETURN VALUES
+The
+.BR rtgrpblib_create_raster ()
+function returns a pointer to a newly allocated object
+upon successful completion, and
+.I NULL
+on failure.
+
+.SH ERRORS
+The
+.BR rtgrpblib_create_raster ()
+function will fail if:
+.TP
+.B EINVAL
+.I width
+or
+.I height
+is zero.
+.LP
+and may fail if:
+.TP
+.B ENOMEM
+Cannot allocate enough memory.
+
+.SH SEE ALSO
+.BR librifunktionsteckensnittsglyfrasteriseringsprogrambiblioteket (7),
+.BR rtgrpblib_reset_raster (3),
+.BR rtgrpblib_set_draftness (3),
+.BR rtgrpblib_fill_shapes (3)