Add a README file.

README

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+Overview
+========
+
+Libdivecomputer is a cross-platform and open source library for
+communication with dive computers from various manufacturers.
+
+The official web site is:
+
+  http://www.divesoftware.org/libdc/
+
+The sourceforge project page is:
+
+  http://sourceforge.net/projects/libdivecomputer/
+
+Installation
+============
+
+On UNIX-like systems (including Linux, Mac OS X, MinGW), use the
+autotools based build system. Run the following commands from the top
+directory (containing this file) to configure, build and install the
+library and utilities:
+
+  $ ./configure
+  $ make
+  $ make install
+
+If you downloaded the libdivecomputer source code directly from the git
+source code repository, then you need to create the configure script as
+the first step:
+
+  $ autoreconf --install
+
+To uninstall libdivecomputer again, run:
+
+  $ make uninstall
+
+Support
+=======
+
+Please send bug reports, feedback or questions to the mailing list:
+
+  https://lists.sourceforge.net/lists/listinfo/libdivecomputer-devel
+
+or contact me directly:
+
+  jefdriesen@hotmail.com
+
+License
+=======
+
+Libdivecomputer is free software, released under the terms of the GNU
+Lesser General Public License (LGPL).
+
+You can find a copy of the license in the file COPYING.