Add README.t2t

README.t2t

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+This is the OwlPS (Owl Positioning System) software distribution.
+
+
+For an introduction to OwlPS, please consult ``doc/owlps.t2t``, which is
+the documentation's entry point.
+
+For copyright and license informations, please consult
+``COPYRIGHT.t2t``.
+
+For a guide to installing OwlPS, please consult ``INSTALL.t2t``.
+
+The file ``CHANGELOG`` lists the changes occured in OwlPS, version by
+version, since its early stages.
+
+Finally, the file ``TODO.t2t`` is a list of potential work to do on the
+system. If you are willing to contribute and are looking for ideas, that
+can be a good start.
+
+
+: Note on the t2t file extension
+  The documentation is provided as text files in the txt2tags format
+  (file extension ``*.t2t``). You can convert them to various formats
+  (HTML, man pages, etc.) using the ``txt2tags`` utility; if you mind
+  the markup tags, you can even strip them using the ``txt`` output.
+  ``txt2tags`` is distributed at http://txt2tags.org/