Started on NEWS entries for nettle-2.5.

NEWS

+NEWS for the 2.5 release
+
+	* Various portability fixes for MacOS and M$ Windows. A lot of
+	  this work done by Martin Storsjö.
+
+	* In particular, Nettle now hopefully works on 64-bit Windows
+	  builds, "W64", including the x86_64 assemby code.
+
+	* Documentation for the base16 and base64 functions. Was
+	  contributed by Jeronimo Pellegrini back in 2006, but
+	  unfortunately forgotten until now.
+
+	* The nettle repository has been migrated from cvs to git,
+	  with a public repository at
+	  http://git.lysator.liu.se/nettle. To make it independent of
+	  the LSH repository, a few files have been moved around.
+	  While at it, files have also been converted from latin-1 to
+	  utf-8.
+
+	The libraries are intended to be binary compatible with
+	nettle-2.2 and later. The shared library names are
+	libnettle.so.4.4 and libhogweed.so.2.2, with sonames still
+	libnettle.so.4 and libhogweed.so.2
+
 NEWS for the 2.4 release
 
 	This is a bugfix release only. It turned out ripemd160 in the