Add COPYRIGHT and BUGS sections to manpage

man/man1/exiv2.1

@@ -794,6 +794,12 @@ copies metadata as is, without any modifications to adapt it to the
 requirements of the target format. Some tags copied like this may not
 make sense in the target image.
 
+.SH BUGS
+Report bugs to: \fIhttps://github.com/Exiv2/exiv2/issues\fP
+
+.SH COPYRIGHT
+The Exiv2 project is released under the GNU GPLv2 license: \fIhttps://github.com/Exiv2/exiv2/blob/main/COPYING\fP
+
 .SH SEE ALSO
 .nf
 .I https://exiv2.org/sample.html#modify