Add man3 pages for the form APIv0.5.0

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+.TH FORM_VALUE 3 2025-10-09 0.5.0 "libweb Library Reference"
+
+.SH NAME
+form_value \- parse application/x-www-form-urlencoded data
+
+.SH SYNOPSIS
+.LP
+.nf
+#include <libweb/form.h>
+.P
+const char *form_value(const struct form *\fIf\fP, const char *\fIkey\fP);
+.fi
+
+.SH DESCRIPTION
+The
+.IR form_value (3)
+function takes a
+.I struct form
+instance previously allocated by
+.IR form_alloc (3),
+pointed to by
+.IR f ,
+and returns the value for a given
+.IR key .
+
+.SH RETURN VALUE
+On success, a valid pointer with the pair value is returned.
+Otherwise, a null pointer is returned.
+
+.SH EXAMPLE
+See
+.IR libweb_form (7)
+for a complete example on how to use this library.
+
+.SH SEE ALSO
+.BR form_alloc (3),
+.BR form_foreach (3),
+.BR form_free (3),
+.BR libweb_form (7).
+
+.SH COPYRIGHT
+Copyright (C) 2023-2025 libweb contributors
+.P
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.