added dependencies and build files (loosely inspired by Sebastian Dorda's love-native-android)

jni/libmng-1.0.10/doc/man/jng.5

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+.TH JNG 5 "July 26, 2000"
+.SH NAME
+jng \- JPEG Network Graphics (JNG) sub-format
+.SH DESCRIPTION
+JNG (JPEG Network Graphics) is a sub-format of the MNG (Multiple-image
+Network Graphics) format. As with MNG it extends on the features of the
+popular PNG (Portable Network Graphics) image-format. 
+.br
+
+This sub-format was designed to support a lossy compression-method.
+It is based completely on the JPEG specification. It adds the high-compression
+ratios of JPEG for photographic images.
+
+As a member of the Network Graphics family, JNG was deemed adequate as a
+stand-alone format as it extends the JPEG format with color-correction and
+transparency features.
+
+.SH "SEE ALSO"
+.IR png(5) ", " mng(5) ", " libmng(3)
+.LP
+MNG 1.00, February 9, 2001:
+.IP
+http://www.libpng.org/pub/mng
+
+.SH AUTHORS
+This man page: Gerard Juyn
+.LP
+Multiple-image Network Graphics (MNG) Specification Version 1.00 (Februari 9, 2001):
+Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
+.LP
+
+.SH COPYRIGHT NOTICE
+The MNG-1.00 specification is copyright (c) 1998-2001 Glenn Randers-Pehrson.
+See the specification for conditions of use and distribution.
+.LP
+.\" end of man page
+